I don't want to hear from guys who are so deprived of female attention that they will do whatever.

Maybe it's the amount of porn around me that pushes my view of what's expected in a relationship. And before there is a crowd telling me that I don't have to do anything I don't want to do - that's exactly why I am not doing it, but if everybody else engages in something my boundaries can limit my options. For example, oral sex is pretty much a must at this point, and yes, nobody has an obligation to engage in it, but it does not help much if your boyfriends make up excuses to break up with you one after another. So I don't find it useful to have a conversation about sacredness of boundaries, it only holds in theory. I need actual answers.