> And not go up and rape a woman, but perhaps take a chance and put their hand on the girls shoulder during conversation to show interest, where they might have otherwise oddly looked away from them. Also, there's a huge difference between personal conduct in a night club and in a library.

Touching someone you don't know is a no-no and many people find that form of contact (even in a night club) to be disturbing. Touching someone without their permission is just something you shouldn't be doing.