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Penis Size Natural Selection


I think you have to consider too objectives: selection of men to reproduce a woman’s offspring, which carries the inference of traits directed at protecting and caring for the female; and selection by a small percentage for sexual satisfaction. I do not believe the two desires (reproduction and sexual gratification) align with the same search by women for attributes in a man. Same applies for men. For sexual gratification we might, in our youth, respond more to external flash, sensual behavior, sexual aggressiveness, etc but when we select for a mate to care for our offspring, and increase the likelihood that our seed was the one that actually fertilized the egg, many men will select females that exhibit characteristics aligned to trust, loyalty, and commitment. Sometimes we are wrong in our choices, but I still feel that we consciously or unconsciously , both men and women, consider the difference between pleasure and reproduction when our focus is offspring vs physical release. At least that’s my believe. For example, I consider my wife very attractive, but she was not the most sensual or sexually aggressive person I dated. Just my take on it.

The only time I can see penis size coming into play is for sperm competition within a group of men. For instance, a bigger guy buries his seed deeper than the rest and thus has a higher probability of getting a woman pregnant, and wins in the odds if more men than himself had recently had sex with an ovulating woman.

Doubtful. This seems more plausible:

But I´d think that something like producing ample amounts of semen might be more important competitively.

Greater promiscuity (greater sperm competition) = larger testicles in primate evolution: chimps (mega-ho’s) have humongous nuts whereas gorillas (relatively monogamous) have tiny ones; humans fall in between. Penis size does not seem to have any obvious relationship to promiscuity among primate species. A good summary here:…rt/stpballs.htm

In my opinion, sexual selection has probably been enormously important in human evolution, including, perhaps, our enormous dick size. Some have argued that even all the fantastic sophistication of the human brain is, like the peacock’s tail, entirely a product of mate choice (for example, this book).

Just out of curiosity, who here is familiar with Evolutionary Psychology?


Before: I'd like to show you something I'm very proud of, but you'll have to move real close.

After: I\'d like to show you something I\'m very proud of, but you guys in the front row will have to stand back.

God gave men both a penis and a brain, but unfortunately not enough blood supply to run both at the same time. - Robin Williams (:


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