Os penis

I've thought about this for a while. Why is it that penis-in-vagina intercourse is pleasurable for men, but not women? (In general, women do not orgasm from vaginal stimulation, and some don't even feel any pleasure from it at all.) I would have thought ...

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... are: Corneas, heart, liver, kidneys, lungs, pancreas, face, skin, bone marrow, blood, heart valves, islets of Langerhans, ovaries, arms, legs, penis, small bowel, bone, uterus, tendons, stomach.its informative for you.

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I see AstraSequi's point: the barbed penis could have provided an advantage enough to eventually replace the non-barbed-penis, the mutation of the barb-receptivity could have arisen some time after, and the barb-receptivity could have provided ...

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... By the end of it, you will probably, at the very least, be struggling to come up with a reconciliation. Let's begin by examining feline penises. They all have a common attribute, and that is the fact that they are all barbed with numerous, small spikes that are of a similar substance ...

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... you mean? Of course there are adaptations within a lineage, I was asking how they could develop! Examples: Some male insects (Damselflies) have 'penis scoops' to remove all the sperm from a previously inseminated female. Some types of Drosophila inject the female with an anti-aphrodisiac to prevent ...

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