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Old 04-12-2011, 12:00 PM
Ready2Fly Ready2Fly is offline
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Quote:
Originally Posted by MrFarFromRight View Post
It therefore seems quite plausible to me that if I were to slip my erect penis into a vagina that had just received a delivery of another man’s ejaculate, I would actually be pushing some of it (perhaps even most of it) even further inwards. So far in fact (ahead of the head, so to speak) that my penis couldn’t hope to scoop it back out on subsequent thrusts.
Plausibility arguments such as this are interesting, but they aren't data. The coronal ridge doesn't have to scoop out ALL the competing sperm, just some of it, to be evolutionarily advantageous.

Take a look at the shape of the vagina. It flares out just before it meets the cervix. And that area enlarges even more during sex, just before she has an orgasm. So a penis that could squeegie into that area, let the sperm settle to the bottom under his coronal ridge, and then scoop out from that area would be just dandy for him.

I believe that elsewhere in the book they discuss an actual experiment which gathered actual data, in which grad students used penis-approximating cylinders of various shapes to attempt to pump out sugar water (or something) from a vagina-approximating tube. They found that the dildos with coronal ridges were greatly more efficient at the job.

Sounds like a fun experiment. One kind of wonders whether maybe, just maybe, the penis-approximants and vagina-approximants weren't approximants at all. That would have been much more fun.

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I respectfully submit that this theory that penis #6 has squeegeed out a determinant amount of its rivals’ offerings doesn’t really hold water. Or other fluids.
Theories stand or fall on data, not plausibility.

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Coming back to the book's penis squeegee theory. If it is correct, wouldn’t this imply that the last male to deposit his offering becomes the most likely to father the future child (and pass his genes on to future generations)?
Not necessarily, especially if it is not a complete scooping, which it certainly is not. And also especially if previous sperm have already made it into the cervix where the penis can't reach. The scooping only has to incrementally increase his chances of being the baby-maker; it doesn't have to make it certain or most likely.

Last edited by Ready2Fly; 04-12-2011 at 12:05 PM.
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