Some of this almost sounds alcohol/drug/mental health related. It's a bit hard to believe anyone that is not on some kind of "substance" or are "overly bold" would dare ask anyone to feel their boobs. In this day and age, there could be more consequences than just a slap. As with anything, there are exceptions.
Of course there are those who encourage "feeling up". That is a whole other story.
Typically (not always) people get as much respect as they allow.