Hm, since we're talking nature, I heard somewhere that humans are one of only 2(or was it 3? I think 2...) species with female orgasm.
So I wouldn't say it's shaped for pleasure. More like for fertility.
3 I believe- Humans, dolphins and bonobos.
I highly doubt it's shaped for pleasure lol, though I'm no specialist. I was also equally dumbfounded with the phrase 'premature ejaculation', seeing as that would be the best course of action for nature to take. Sex is a means of propagation, first and foremost.
Female orgasms cause the uterus to contract and pull sperm further in, enhancing reproductivity. Arousal, where the vagina becomes lined with friction reducing fluids, also allows the sperm to travel further with less resistance. It's quite possible that penises with a certain angle, shape, length, stamina etc that could aid in female orgasms would've been naturally selected for because sexual intercourse with orgasms would more often lead to pregnancy than without. A lot of technology attempts to recreate what evolution has done naturally; so the first idea to pop up into inventors' heads were penis shaped penetration sex toys. They seem to work to a certain degree, so I'm pretty okay with them in doujins.
last edited at Dec 3, 2014 6:26PM