Well I was stating in statistical terms. Most men may not want to have intercourse if proposed by an old, obese woman with poor hygiene. However most (if not virtually all) women may not agree on the spot to have intercourse even if proposed by a male supermodel. 

In fact they had a study when a cute girl on campus offered guys to have intercourse, and the vast majority agreed. Whereas when a cute guy asked to have sex to girls on campus, not a single one took up on his offer. And I doubt that after the sexual liberation, women refused (at least primarily) because of some social standards, rather than their own, ingrained standards. 

I do agree that religion may influence a lot of our mores, but as they saying goes: "man created god in his image", that is the vengeful, sexist, homophobic and characterize by all the other attribute of the typical ancient patriarch. 

Regarding animals they may deploy different strategies, for example females cats allow to be screwed by a bunch of toms, and then they release their eggs, so the fittest sperm gets the prize. 

Bonobos stereotypically make make much more love than war and chimps vice versa. Humans are equally related to both chimps and bonobos. So they can be a mixed bag. Still it's hard to deny the typical emotions humans experience in the interactions with the opposed sex. Free-love communes have been tried and failed. And situations when one husband has multiple wives are much more common then vice verse. So, while random stuff does happen, the evolutionary logic remains strong & sound amidst all the noise.