rough sex: how rough is too rough, and why does he like it so much? is it wrong for me to allow/encourage this? mastrabation: i haven't yet been able to get myself off is this something i have to learn on my own or is there something basic i don't understand? how do you make sex last really long? is this the guys problem and not mine? and sometimes when i'm having sex i feel like some muscle inside of me is clenching up and making it really hard for a guy to get in, what does that mean?