In this case
Are you refering to mammals in particular as in nature there aare many examples when the male is merely a pair of testicles to be used and the female of the species has the power (that fish thing whose name escapes me at the moment and many spiders etc)? (just being picky about the "wild state" bit)
Again looking at nature and looking at most species other than Humans you see that the majority of females in nature would be termed sluts in human useage as they tend to have sex with multiple partners during their respective seasons, and the males are just there to provide the fluids.
As humans have evolved from a species that has sex just for procreation and turn it into a hobby, I would suggest that the society pressure is the key factor. This I would place at the door of religion meaning that sex is a bad thing and you should only do it for teh creation of life, otherwise like most other mammals when a women was approaching her most fertile (during each monthly cycle) she would be fucking anything with a cock to ensure both successful impregnation and also the greatest chance of genetic diversity.

(I have rambled a bit there and hope it comes across as the coherent argument I have in my head)

edit as teh above has just said while I waffled on and on
(Bonzodog29 is an unemployed sponge of the worst kind, Mon 17 Jan 2011, 16:15, 1 reply, 15 years ago)

I was referring specifically to humans.

(LongJohnBaldry, Mon 17 Jan 2011, 16:49, Reply)

I did realise,
I was merely being an arse,
(Bonzodog29 is an unemployed sponge of the worst kind, Mon 17 Jan 2011, 16:55, Reply)

Well, that's fair enough.

(LongJohnBaldry, Mon 17 Jan 2011, 16:57, Reply)