you're right, it's just probably that you guys were going at it too rough. same thing has happened when my ex and i were having sex, but his dick wasn't covered in blood...but there was some there, enough for him to freak out...but...i was able to calm him down about it....sooo...i dunno. you might need to get checked out, and make sure that nothing's wrong, that's what i would advise, just to be safe. and yeah, talk to him. just ask him what the fuck is going on, and if he makes some lame excuse about how that freaked him out, reassure him that it's fine now. if he keeps acting weird, then don't waste your time fucking him. and don't feel shitty about yourself and your body!!! there's no need to!!