Pharyngula

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Tuesday, May 24, 2005

Orgasms aren't explained by Intelligent Design creationism

Several people (including Lauren) have mentioned this article on teaching Intelligent Design to me. I've got to say…I wasn't impressed with it. I get the point—the author thinks that silly theories, from ID creationism to Hoyle's panspermy to von Daniken's ideas about aliens can be entertaining hooks to draw kids to the good science—but his own article illustrates why it is a bad idea. It's a strategy that leads to a superficial, cartoonish view of the subject.

Controversies are fine as a tool to start a discussion, but they require that a) the teacher understands the material very well and can clearly state why some ideas, such as von Daniken's, fail to meet scientific criteria, and b) students have to understand the core ideas being critiqued first. Charging in with a laundry list of crazy ideas without a foundation and without a plan to teach kids how to evaluate them is a recipe for confusion.

Here, for example, David Morris completely mangles an idea. It does not fill me with confidence that this is a good plan to teach science.

I recommend that biology teachers begin by discussing Elisabeth A. Lloyd's decidedly scientific book, The Case of the Female Orgasm. No school board member should complain. The book's subtitle, "Bias in the Science of Evolution," clearly fits with the new requirement that teachers critique evolutionary theory.

Hold it. Lloyd's book is a somewhat technical book by a philosopher of science; how does Morris plan to introduce it to high school students? I'd be reluctant to ask college students to read this book, except in an upper-level course dedicated to the general subject. You're going to have to find a much shorter treatment of the subject in order to make this work at all (there is one, but I would have hoped that anyone proposing this lesson plan would have already been familiar with it.)

Darwinians can explain the male orgasm. After all, the male ejaculation is necessary for the survival and perpetuation of the species, and if giving the male great pleasure while doing so promotes that, then natural selection would eventually endow the male orgasm with that characteristic.

Stop again. Yes, there are Darwinian explanations for orgasms. Do these hypothetical students understand them? Morris is assuming what he is supposed to teach. Before we can plunge into problems in the explanation for the female orgasm, these students need to understand the basics of selection and adaptation.

When it comes to the human female orgasm, however, evolutionists are stumped. No other female of the animal kingdom experiences an orgasm. Professor Lloyd examines 21 evolution-based explanations for the female orgasm, and demolishes every one of them.

Uh-oh. Professor Morris has just flopped. He got the story all wrong. This does not bode well for the lesson plan.

First of all, the Darwinian explanation for the male orgasm is still perfectly applicable. If it is advantageous for males to associate sex and pleasure, driving them to procreate more frequently, the same is true for females. I may not have known much myself as a teenager, but I could understand how it would be to my advantage sexually if the girls also enjoyed sex.

The adaptive dilemma is why women are not 'optimized' to achieve orgasm from vaginal intercourse. It's not surprising that women have orgasms, but that the way they have orgasms isn't more directly coupled to procreation. I think it would be an excellent idea to teach high school kids that the best way to stimulate a woman involves clitoral stimulation and doesn't require penile insertion at all, but that's going to lead the class off into entertaining directions that aren't necessarily going to help them learn about evolution.

Secondly, Morris has his facts wrong. Other female mammals do have orgasms; like us, though, copulation is relatively ineffective, but they respond to clitoral stimulation. Lloyd's book explains this; hasn't he read it?

Finally, he has misstated Lloyd's conclusion. She demolishes the adaptive explanations, not the evolutionary ones. This is a significant distinction that the students will need to understand in order to grasp this story, but apparently the teacher here is oblivious to it. Why, without understanding that, the teacher might screw up and propose Intelligent Design as the only remaining alternative, rather than the actual explanation given by Lloyd…like this:

Here the biology teacher might offer the class the alternative explanation of intelligent design. Is the intelligent power simply leveling the playing field between the sexes? Or is Professor Lloyd right that the female orgasm is "just for fun," and the intelligent power is female?

It's obvious that Morris has not read the book he is telling us we should use, and has completely misinterpreted Lloyd, or is dishonestly misleading us about the contents of the book. The actual answer is the same one SJ Gould gave in his essay, "Male Nipples and Clitoral Ripples" (which, by the way, cited Elisabeth Lloyd's work…in 1991), from Bully for Brontosaurus. It's all about development—male and female genitalia are derived from identical beginnings, and evolved in parallel. Gould's explanation is simple and clear.

Males and females are not separate entities, shaped independently by natural selection. Both sexes are variants upon a single ground plan, elaborated in later embryology.

No mention of intelligent designers, female or otherwise. No unwarranted teleological goal of "leveling the playing field".

If we want to take Morris's suggestion of bringing exciting issues into the classroom, it seems to me that we don't need von Daniken or the Discovery Institute, and that these bogus controversies actually detract from what the students should learn. Read Gould's essay; what you'll find is a substantive discussion of the genuine conflict between adaptive explanations and structural nonadaptations.

Why would anyone propose that we lecture on nonexistent controversies when there are real ones that are more interesting and more productive and more useful to students of biology? It seems the only people who suggest such things are the ones who don't understand the science in the first place. Maybe if they hadn't wasted their time reading screwy stories about ancient astronauts or genes floating down from outer space, they wouldn't garble the biology so badly.


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Comments:
#25947: John Wilkins — 05/24  at  11:30 PM
A distinction worth remembering in this context also is Sober's distinction between adaptation and adaptive. Something may have been an adaptation at one point but not now be adaptive. Likewise, something might now turn out to be adaptive without having been selected for it (i.e., be an adaptation).

Female orgasm may have adaptive consequences now (that is, in the post-Pleistocene era) without it having been an adaptation before.

John S. Wilkins : evolvethought.blogspot.com



#25954: coturnix — 05/25  at  02:15 AM
I am glad you agree with me - I saw quite a lot of positive responses to Morris's article and started wondering if my negative response was based on something I may have missed (I am vainly assuming that I am one of those "several people" you mention in the beginning).

ê



#25957: outeast — 05/25  at  02:29 AM
I was posting a comment, but it got a bit long so I stuck it on me own blog as a post instead. (http://aclosershave.blogspot.com/2005/05/teaching-controversy.html)



#25958: — 05/25  at  02:32 AM
Female chimps reach orgasms, bonobos definitely so. Cats on hot summer nights - I am making an assumption based on sound signals - also do.



#25959: — 05/25  at  02:35 AM
Ach, now I realize what they mean by "teaching the controversy"!



#25960: — 05/25  at  03:16 AM
Women have orgasms?



#25973: Matt McIrvin — 05/25  at  07:36 AM
It sounds to me as if this guy is actually one of those Fortean "more things on heaven and earth..." types who is upset that the stodgy closed-minded scientists won't teach von Daniken and Hoylean panspermia and a million other pleasantly wacky things. My reading is that he actually finds these ideas to be credible challenges to modern biology.



#25974: rob loftis — 05/25  at  07:41 AM
First of all, the Darwinian explanation for the male orgasm is still perfectly applicable. If it is advantageous for males to associate sex and pleasure, driving them to procreate more frequently, the same is true for females.

Perhaps I am hewing too closely to Lloyd's exact way of putting things, but I don't think this is really true. Orgasm has to be distinguished from sexual pleasure in general, or even just a drive to have sex. It is narrowly defined as a set of muscular contractions.

Lloyd concedes at the outset that female pleasure in sex is adaptive, but this actually makes the case for an adaptive female orgasm harder, because it seems superfluous.

The adaptive dilemma is why women are not 'optimized' to achieve orgasm from vaginal intercourse. It's not surprising that women have orgasms, but that the way they have orgasms isn't more directly coupled to procreation.

Agreed. It is also worth noting that the adaptive dilemma has been completely ignored by the adaptationist camp in this debate.



#25975: — 05/25  at  07:50 AM
I'm not an evo biologist, so this is probably old hat. Here's my idea--the male orgasm makes males *stop* having sex, and is reinforced by flaccidity. The function of orgasm in males isn't primarily the rush of pleasure, but the relative reduction in pleasure afterward. This makes it more necessary for males than females--it makes them go away. Females often benefit from having sex with multiple partners in their fertile periods. There is an evolutionary drive for females to enjoy sex, and moderate stimulation of the clitoris from vaginal sex does this, but there is no stong evo driver for female orgasm. It occurs primarily due to the male/female developmental structural similarity.



#25977: rob loftis — 05/25  at  07:57 AM
Female chimps reach orgasms, bonobos definitely so. Cats on hot summer nights - I am making an assumption based on sound signals - also do.

Interestingly, the strongest evidence for female orgasm in nonhuman primates in the wild comes from female-female pairings of stumptail macaques. The case for chimps and bonobos is weaker, but still there (citations in Lloyd)

It is also important to distinguish the capacity for orgasm from the actual presence of orgasm in the wild. Symmons speculates that all female mammals are capable of orgasm, but only humans actually orgams regularly in the wild. The most well confirmed nonhuman female orgasms are all in rather unsettling laboratory conditions. Stumptail Macaques have been tied down, wired up to measure heart rates, breathing rates, and muscle contractions, and then masturbated to orgasm. I have no idea what a stumptail would make of such an experience.

I don't think cats orgasm in the wild, or even particularly enjoy sex. A compulsion to mate is not the same thing as pleasure, which in turn is not the same thing as orgasm.



's avatar #25985: PZ Myers — 05/25  at  08:32 AM
As Wilkins mentions, it could be adaptive without being an adaptation, and it is also certainly true that sex can be driven without pleasure as an incentive. I also don't think we need to look outside the human species to see successful procreation with anorgasmic females. Of course, all this makes both adaptationist and ID explanations difficult...but fits perfectly with the idea of the female orgasm as a developmental non-adaptation (which doesn't diminish it's value in the slightest, I hope everyone understands).

One important mistake that Morris makes, though, is to confuse that with a non-evolutionary explanation. Development certainly is a natural part of the evolutionary process, one tested and true.

PZ Myers
Division of Science and Math
University of Minnesota, Morris



#25996: Lauren — 05/25  at  10:23 AM
Honestly, I liked the tongue-in-cheek aspects of the essay, in part because of the anti-feminist, ID loons trolling my blog right now. I enjoy poking fun.

Thanks for this thoughtful response.



's avatar #25999: PZ Myers — 05/25  at  10:51 AM
Tongue-in-cheek is good. I know I'm not funny enough to deal with the creationists as light-heartedly as I should. The problem with Morris's article, though, was that he used the humor to sell bad ideas to the reader, and that bugs me.

PZ Myers
Division of Science and Math
University of Minnesota, Morris



#26024: Becky — 05/25  at  12:49 PM
First, I'd like to respectfully remind everyone that just because no one has determined a physiological function for the female orgasm doesn't mean that there isn't one. And just because it doens't have the same function as the male orgasm doesn't mean it is without any function.

First of all, the Darwinian explanation for the male orgasm is still perfectly applicable. If it is advantageous for males to associate sex and pleasure, driving them to procreate more frequently, the same is true for females


I am in complete agreement. In my opinion (as an evolutionary biologist) receiving pleasure from having sex is a strong enough force to direct an evolutionary trend towards a physiological adaptation. Females that like sex are more likely to have sex and are more likely to give birth to offspring that like sex, etc.



#26031: coturnix — 05/25  at  01:37 PM
Sorry for OT....There was a wonderfuul interview with Vermeij this morning on NPR (Morning Edition). Apparently he has a new book out that applies evolutionary models to economics/society. Has anyone here read the book yet? Any insights?



#26052: tristero — 05/25  at  04:12 PM
I agree with PZ on this one. Science class is for science. Not for proving that Von Daniken is not science.

OTOH, another class, one in debunking the tomfoolery out there, like creationism, worlds in collision, and ufo's, now that's a great idea.



#26072: Dan S. — 05/25  at  06:13 PM
"Cats on hot summer nights - I am making an assumption based on sound signals - also do."
Well, - from wikipedia:
The male cat's penis has spines which point backwards. Upon removal of the penis, the spines rake the walls of the female's vagina. This stimulation is required by the female in order for ovulation to begin,"

Ouch!



#26101: — 05/26  at  12:21 AM
Females that like sex are more likely to have sex and are more likely to give birth to offspring that like sex, etc
It must be more complicated than that. Females that like sex too much are disruptive of ordered society. All societies try to control and depress female sexual urge, and sublimate it into constructive - non selfish - activities. Moreover, I remember having read that most prostitutes are sterile, and that promiscous women have lower than average fertility (probably due to infections).

I dont know if
The male cat's penis has spines which point backwards. Upon removal of the penis, the spines rake the walls of the female's vagina. This stimulation is required by the female in order for ovulation to begin
means that cats do have great orgasms or if it means that enjoying sex is unnecessary or maybe even counterproductive for reproduction.



#26127: coturnix — 05/26  at  08:02 AM
We have to keep these three things separate: sexual reproduction, sexual pleasure, and orgasm.

1) Sex: Maynard Smith and others have grappled for a long time with the problem of evolution of sexual reproduction. If you reproduce by division or budding, all your offspring are exact genetic clones of you - the most preferred option for you from a fitness standpoint: it is fast, safe and clean. Biologists generally do not like the "good for the species" arguments, but sexual selection is really good for preserving lineages (as it introduces gene-shuffling, hence genetic variation, thus faster adaptation to changes in environmental circumstances). But the individual suffers: first, it has to come out of hiding into the dangerous world in order to find a mate, second it gives each offspring only half of its genes. This is already a big concession to give, and that is why we do not see any reproductive system that requires the existence of three or more sexes, although they are theoretically possible. It makes sense (but needs to be tested - this is in no way conclusive) that species selection had a say in the evolution of sex. Opponents of species selection re-define "fitness" to include many (or infinite) generations of offspring instead of usual one or two - a metric used by biologists in day-to-day research.

2) Pleasure: When two Paramecia (silver-slippers: Protista) meet they have "sex", i.e., conjugation. Do they feel pleasure? I doubt it. How about plants - does it feel reeeaaal goooood when the guy-oak's pollen lands on your flower? While fission or budding may be pre-programmed, the complex behavioral activity of leaving the safety of your burrow, going out into the dangerous world, looking for a mate (wasting time better spent foraging), competing for a mate (dangerous), evaluating the quality of the mate (tricky and often dissappointing), mating (yukky and potentially very dangerous), laying eggs or giving birth (potentially dangerous), parenting (expensive!), starting all over, requires a lot of "decision making" by the animal. There are so many negatives (somewhat more for females than males, though), it makes sense that more complicated the mating setup, more dangerous it becomes, and more it appears likely that some kind of reward may be neccessary. A Just So Story so far, but it appears that many animals (both sexes) enjoy sex and it is reasonable to test the hypothesis that sexual pleasure is adaptive in both sexes.

3) Orgasm: See what Jim Lund wrote above. Having sex is very pleasurable (take my word for it wink ), but ALL of it, not just the orgasm. Meeting somebody attractive is pleasure in itself, talking, exchanging glances, touching, kissing...all great pleasure. In a sense, climax is anti-climax ("Darn, it's over! Was I too fast?") - makes you stop. If pleasure is adaptive (in order to have you go out and risk having sex), then perhaps orgasm is adaptive in stopping the pleasure once insemination is over (and scurrying back to safety, or going foraging). That is, perhaps, why orgasm happens at the time of ejaculation and not an hour later. That is, perhaps, why the timing of MALE orgasm is important. If a male does not have an orgasm, he'll just keep going and going like an Energizer bunny, endangering both of them (getting eaten in flagranto) . On the other hand, fertilization will happen if the female does not experience an orgasm, but that does NOT mean she did not have pleasure!

If a female orgasm was an adaptation, what would be its function? If it was an adaptation, wouldn't we expect selection to make it easier to achive one by moving the sensory endings into the vagina itself? If it was an adaptation, wouldn't we expect a much greater percentage (perhaps even 100%) of women to easily achive an orgasm during vaginal sex? If it was an adaptation, why is there such a wide variation among women (and not among men)? Have you seen the website Beautiful Agony? All guys are the same. Women are all different! Some immediatelly fall asleep afterwards, some get there fast, some take a long time, some are quiet, others noisy, some do it once, other have a whole series of orgasms, or do it a few times in a row. If it was an adaptation, this kind of variability would not be expected.

All of this suggests that developmental parallels with the building of male genital organs is the most likely evolutionary explanation for female orgasm. That does not mean, as John Wilkins pointed out at the top of the thread, that this may not BECOME and adaptation today. The evolutionary pressures today are very different from 10,000, or 100,000, or 1,000,000 years ago. Perhaps having an orgasm has a function for a CIVILIZED female. Any ideas?



#26134: Becky — 05/26  at  08:29 AM
jaimito,

I was not referring to civilized humans. Rather, I was trying to illustrate how heredity and selection could have lead to the female orgasm somewhere in our ancestry.

For analogy, a caterpillar that looks more like a twig than its conspecifics is more likely to escape predation and therefore lead a longer life and have more offspring. These offpsring (assuming that the camouflage is inherited)will in turn be more likely to escape predation and have more offpsring. This eventually leads to a entire population of caterpillars that look like twigs and few caterpillars that do not.



#26204: — 05/26  at  04:43 PM
Becky, I know you were not referring to civilized humans. There may be no such thing at all. The function of female sexuality was set a few millions of years ago in pre-human hunter - gatherer bands, and I dont think that females that liked sex had a reproductive advantage. If anything, sex imposed by force seems to be reproductively a bit more effective, as violations produce pregnancy at a higher rate than consensual sexual acts. (I dont remember where I read this non PC bit of information, but I could find it). Human female sexuality is very complex, this is a subject I gave much thought to in my adolescence but never understood so allow me to stop here.



#26376: Socar — 05/27  at  05:00 PM
One thing I've always wondered about non-human sexuality: why do female rats' ears vibrate when they're having an orgasm?

(You don't have to answer that!)



Trackback: The….er…Spector of Evolutionary Psychology Rears Its Ugly Head… Tracked on: Sporules (66.33.193.55) at 2005 06 16 17:25:25
But it’s more likely that, as my husband so delicately put it, “gross anatomical similarities” might make orgasm relatively more or less likely during intercourse - e.g. the size and placement of the clitoris, relative tissue densit...



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