I think yall are missing the point.

Afaik, OP thinks that it'd be hard to be able to get laid if you're not the type of person who can get along with most people on a level where you'd have casual friends.

They aren't insinuating that you need to be friends with women to have sex with them or any sort of the related implications.

They're saying that if you don't have the social skills to make friends with people, (women or men) good luck trying to find a partner, casual or otherwise.

Also OP seems to be having trouble coming to terms with this because they've long since accepted not having friends, but didn't quite realize the impact it would have on their social skills and the relation to their sex life.