A: I'm always being asked this question, and I guess it's time to answer it once again. First of all, most of the products you see don't work, and the risks of surgery are just not worth it. And to most women, the size of their partner's penis is not important. So, even if your penis is on the small side when erect, don't worry about it. Find other ways to show off. Get advanced degrees. Become a bodybuilder and develop big muscles. Learn some other languages and wow the ladies with your knowledge. Learn how to play an instrument (the ladies love musicians). Stop worrying about this one part of your anatomy, and I promise you this problem of yours will go away, because size does not matter.

Q: I have a friend who claims to be pregnant. She said she was three weeks to one month pregnant and that she knew it was with twins. I know it's not common to have an ultrasound so early in the pregnancy, but is it even possible to tell if they would be twins?

A: While I don't know for sure, I doubt it. At that early stage, the heart would not be formed and beating, so I don't think there would be any way to detect whether she had one or two fetuses inside her.

Q: My boyfriend, 43, recently has begun to ask me to slap him on the face and push him around when we have sex. He also loves to be restrained by having his hands bound over his head, and his feet bound as well. This also includes blindfolding him. He wants me to "do with him as I will." He never wants to do any of this to me, which is more than OK with me. I don't mind the bondage stuff, but it bothers me to slap him. I don't want to hurt him while we're supposedly making love. Can you tell me what causes such masochistic behavior? I don't understand his increasing need for pain during sex. He can't or won't tell me why he wants me to do this, and he assures me it doesn't hurt. It still upsets me to do this to him. It's especially odd because he is a control freak outside of the bedroom. Please explain this behavior so that I can better understand him.

A: Sorry, but I am not an expert in this field, and to tell you the truth, I don't want to become one. But what is most interesting is that you say that outside of the bedroom he is a control freak. I have read articles where this is the case — a person who is very controlling outside the bedroom needs to be dominated in the bedroom in order to get sexual satisfaction — and so in your case, I do believe it is related. But since I don't know for certain what causes this type of desire, I don't want to make any guesses.