Sometimes I masturbate before I go to sleep at night. Usually nothing is wrong, but sometimes (and this always occurs at night, I've found) after I masturbate, a few minutes later I have to urinate. And when I do, it is usually very painful. The feeling doesn't pass either. My scrotum usually gets very tightened up, and there is painful feeling above my crotch. Usually I just sit there, drink some water until the feeling goes away. ANY idea what this is?

I'm about to enter college and female, and, just recently, I've been attracted to a few girls. I also get aroused when I see two women having sex or kissing. I've had three boyfriends in high school, and I think I am still attracted to men. I would really like to experiment with girls to see if I am a lesbian or a bisexual. What should I do?