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Anonymous
>>208439 yeah pretty much. The whole shape of the head of the penis is to, in laymen's terms, while thrusting, scrape the inside of a woman's vaginal canal clean of competitor's sperm so that yours will have less competition in getting to the egg, many animals that aren't sexually dimorphic employ this method. I know there's a special term for this too but I can't remember it at the moment. There's lots of little tiny things like this that are most evident in human beings, like how white/middle eastern people are statistically less likely to have lactose intolerance because dairy and cheese have been food staples in europe where cultivation is harder than say east asia, where milk as a beverage was introduced like, barely a couple hundred years ago
/biologyfag
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