I am (still!) a virgin and have a question about the hymen. I know mine is not entirely intact, because I did a lot of horseback riding as a child. But as I'm not a tampon-user (nor wish to become one), I'm not exactly sure how painful intercourse will be, for the first time, nor what will happen to the hymen.

I always assumed it was a thin membrane that, upon penetration, would shrink evenly to the sides. But I seem to have what you might call a flesh tab, and though I've looked at pictures offered in Our Bodies, Ourselves, I'm not sure I understand how an opening will be created, and have the horrifying idea that a piece of flesh is going to drop out or be torn right out of me. Is it normal to have a flesh tab? What will happen to it? And if I tried inserting a tampon, would that facilitate the tearing process? Please help.

I am a twenty-three-year-old male who has a question about my scrotum. My scrotum seems to be tight up against my body, only sometimes does it drop a little lower. I thought that maybe my scrotum was just late in growing properly. Now I am not so sure. What should I do?

I have a weird question. My boyfriend and I were talking and he told me that men's balls move on their own throughout the day. I did not believe him so he showed me. He got undressed and laid back on the bed and told me to lift his penis and watch real close. I did and unbelievably, his balls moved. It's like they vibrated kind of like a heart beat. It was so cool. What makes a man's balls move alone?

Should a normal man's penis become erect for a certain number of times throughout one day (without any external stimulus)? Or, do these erections occur only while a man is sleeping? I have been masturbating once every day or every other day, and I have noticed that I rarely get any of those spontaneous erections during the day at all. Plus, I have been waking up with no morning erection during the past week. Have I been masturbating too much?

I'm sending you this message from the top of the Sierra Nevada mountains of California. My wife just experienced her best orgasm ever. We live by the beach, a very low altitude... so that made me wonder, although crazy, "Does altitude have any impact on sex?"

If it doesn't impact sex, it definately impacts the lube bottle as it came squirting out on it's own...

While reading some of your responses to female arousal, you say that the clitoris is as sensitive as the penis. Why is it then that when I touch mine, I get only a little pleasure, if any? Yes, I know where the clitoris is, so that's not the problem. What's wrong with me?