As a student of bio-anthro, as human brains became larger and gestation became longer, women with narrower pelvises died more often in childbirth. The women who's genetic variation gave them a wider pelvis were able to survive childbirth more often. Therefor their daughters were genetically presupposed to wider hips and so women evolved to have wider hips in general.Correct.
And before modern medicine, narrow hipped women much more likely to die in childbirth and take the kid with her.
It is true as stated earlier that more men also are attracted to wider hips as well as larger "external" breasts as it allows the men to see the women as child bearers. You'll notice the other great apes (of which we are one) have internal breasts, flat chested.
As well, human women are multi-orgasmic so as to encourage them to have sex with many men in a row searching for the strongest genes (hey, that's my name!). Men's penises are shaped in a way to pump out the previous man's semen. Human men take a bit of time to ejaculate to further the effect of pumping out the previous guy's semen. The other apes have small carrot shaped penises and these same primates ejaculate nearly instantly.
The researchers who work with bonobos, when interacting have to do the "bonobo handshake" which is a quick penis tug with near instant ejaculation, before getting down to business. Otherwise the bonobo will not relate. There's an excellent book called "Bonobo Handshake".
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