I agree Alexandra. This is an interesting discussion. Here's what's not okay with me. I'm not okay with having sex outside of a serious relationship. I have friends who have fun with casual sex and that's fine for them. I don't think that what they're doing is wrong; it's just not for me. Sex isn't just physical for me; it's very emotional too. So, I need to really trust someone and care deeply about them (and know that they feel the same way about me) and feel a strong emotional connection with them before I can have a physically intimate relationship with them.