Interesting perspective.

The reality is that there are drawbacks to indiscriminate sex. Disease, unwanted pregnancy, the fact that many hyper-promiscuous people have low self-esteem and are using sex to assuage that.

Taking these in order -- in the (intelligent part of the) first world, disease and unwanted pregnancy are essentially nonfactors. Yes, those are powerful historical reasons not to have indiscriminate sex, but we can throw 'em out with the bathwater in enlightened places. The last point, about promiscuity and self-esteem, is a little off in my opinion. Cause and effect are reversed. Promiscuity isn't causing the low self-esteem, it's being caused by it. So your point is less a comment on promiscuity and more a question of how can we help people who don't respect themselves.

That said, I agree with you about the pseudo-evolutionary point about what humans tend to want in partners. Both men and women I think in general would rather be in a long relationship with someone who has in the past been less promiscuous, for the reasons you mention. That's just a guess.

So in summary being more discriminate with whom you have sex with is (a) wise and (b) a more desirable trait, for BOTH genders.

I would respond: wise in some parts of the world, but wisdom is a bit irrelevant in the cleanest and safest places. The desirability part makes sense to me, even I don't like that it is the way it is.