Maybe I'm just strange, but I always figured that the sign of being mature enough to have sex was being able to discuss it with your boyfriend first. I don't mean everything, but surely you should be able to tell him how you feel about it, and be able to talk about methods of contraception? I'd view it as quite a glaring sign of my not feeling comfortable enough to have sex with a boyfriend if I couldn't talk about it first. I don't mean that you have to discuss every minute detail, but the basics are quite fundamental IMO... But then, that may just be me...