I’ve seen a lot to suggest that people are less sexual, but I haven’t seen that people are less sexually liberated. I’m not trying to pick, because it’s very possible, but ime*, the younger you are, the more sexually liberated you are.
What symptoms of reduced sexual liberation have you picked up on?
*My experience with Gen Z is mostly through teaching college students, and I know that’s not necessarily representative of the population as a whole.

My default fist also does, but all I need to do is angle my hand towards the thumb and then it looks like the picture