Interesting post SGB, thanks.
However this: "It would appear to be true that women, more than men, have less tolerance for rubbish sex. Male sexuality can in some men be pretty linear ? find a hole, enter and ejaculate." is pretty much all I was saying. You bury it amid a ton of other factors, but that doesn't make it less true, or relevant.
The problem with your insistence on sexual gender equivalence is that you confuse observation with moral imperative. The simple observation that most men are more open to quick, easy, casual sex than most women are, is in no way the same thing as a moral judgment upon that minority of women who are open to it. Personally I have no problem acknowledging the observation, as a generalisation, while also accepting that people have the right to live their lives how they want, and if a woman wants to sleep with a different man every night and she's happy, good on her. I vigorously and actively fight against attitudes (from BOTH sexes) that judge women for sexual promiscuity.
But you put the cart before the horse. You seem to say "We should get rid of unequal gender-biased judgment of peoples' sexual desires (with which I agree) -and in order to do that, we should ignore the evidence before our eyes that there are widespread general differences between those of men and women (which is silly).
Your thesis simply fails to stack up against reality. Why is it that all over the world, in practically all cultures that we have ever known about, men have sought out multiple partners so much more than women? Why is prostitution known as the "world's oldest profession", and both it and its virtual form - porn - massively more patronised by men than women? Why does the widespread culture of going on the pull every weekend inevitably end up with vast numbers of men seeking to score, most being disappointed, and a much smaller number of women taking their pick while the majority don't bother because they'd rather not just go home with anyone? Why do many swingers clubs have strict restrictions against admitting single men, only allowing men to enter as part of a couple? (while not, as far as I've ever observed, applying any such restriction to single women).
Are all these differences due to culture rather than innate physicality? Quite possibly - I don't think we can ever possibly disentangle the two to know, and I don't personally think it actually matters that much. Culture isn't going to disappear any time soon, although I certainly support attempts to challenge it, allow it evolve and avoid discrimination on the basis of it.
But I don't see the point in denying observation of reality.