Someone else pointed out I was really uncharitable with reading your post, just wanted to apologise. I'll leave my crappy response up for some good ol public shaming

The question I posited was: if all signs point to men and women having equal amounts of sex, why is there no "female loneliness epidemic" but there is a "male loneliness epidemic"? I posit that the reason we think of sex as a benefit for male loneliness therefore can't be quantity of sex but men must be getting something from sex that women either don't need or are getting elsewhere. Since scientific evidence points toward gender differences being social and not innate, there must be something women are doing different socially that leads us to think of men as a population as in need of sex or intimate relationships but not women. I'm presenting a neutral logical argument here by way of discarding illogical conclusions, not accusing anyone of anything or implying that the comment above me was accusing women of being too promiscuous. I just wanted to ask the question of why are straight men lonely but straight women not lonely even though logically the two populations must be dating and having sex at approximately equal rates

I think that's part of it but less and less so nowadays and especially the younger generation. I think the aversion to physical or emotional closeness is more cultural memory at this point than homophobia, but it might still play a part. Like someone else pointed out, I think a big part of it is just wanting to feel a bit special but just not having existing avenues for support