Gee Alan Smithee, you need some imagination. I’ve done all sorts of things with no chance of reproduction. And I’m not even gay - my gay/lesbian/bi-sexual friends can have even more fun without risk of reproduction. And I’m not a big proponent of casual sex. Course, maybe you think Clinton was telling the truth about Monica because there was no penetration?
To address the OP, I think most adults believe in moderation in sex. That is to say, they wouldn’t get laid every night by a different good looking stranger even if they could. But most adults seem to think that in addition to lovemaking, there is a place in the world (perhaps not their world) for casual sex. And perhaps a realistic appraisal of sometimes its hard to seperate lasting love from the potential of love from infatuation and even just “yummy.”
Looking back on the boyfriends I had back when I was single, I though there was “something” worthwhile there at the time with all of them. Now, there are a couple of them where I wonder what I was thinking. Not that I regret the sex. Its just that at 35 I think I could potential categorize “something” much better than I could at 19.
I also think our society is “sex saturated” Its easy to convince yourself that everyone else is horny as hell and getting some. And the only ones that aren’t are complete prudes. But in truth, its probably a bell curve.