Number 1. NEVER use scissors!!! Just when you think you are good at it!

Please listen to whomever posted that before me, we speak from experience.
ok not that that is out of the way. I never saw it with hair, it reminds me of a 70's porno. That just doesn't sound like something anybody wants to be faced with, pun intended. I don't think that it looks proper in a bikini either.
There is no way I'd consider a guy who wasn't trimmed down there. It's so unnecessary and I've never been with one. Just take it off, no problem. No reason to have loose hairs everywhere, and in your you-know-where too. Yuck! I would feel a little violated if I saw that a guy didn't take care of himself down there.
I don't think it's pre-pubescent at all, unless you consider shaving your legs and underarms the same thing. I leave a strip or an oval or something there. Just look at a Playboy they look beautiful and tasteful. Now there is the answer for you, what most guys like. I think hair down there is more fetish than popular these days.
As for the itchies, I hear deoderant works, I used to use aloe, the kind you drink as an aftershave, now I don't need that, it's about finding a razor that suits you. Your skin adjusts to it. It never bothers me and I'm always super clean as a whistle! If they don't like it, they know where the door is. Never had that problem though.