A: Visual stimuli sexually arouse males. Many young men might get sexually aroused by their mother if they allowed themselves to think about it. But if most young men see their mother, their sister or another relative in sexy attire, they will look away and try to push any sexual thoughts out of their mind. You, on the other hand, have allowed these sexual fantasies to enter your mind and develop — and for far too long. This probably is keeping you from developing a relationship with a female outside your family, so it is detrimental to you. What you must do is switch your sexual interest to someone else. If you could find a girlfriend quickly, that would be best, but if not, then start fantasizing about some movie star. Do not allow yourself to fantasize about your mother anymore, and over time, I would guess these thoughts will at least fade, if not go away completely. On the other hand, if you continue to allow yourself to have these fantasies, you're going to encounter severe psychological problems.

Q: I am 15 years old. How come no matter how many times I try, I can never see sperm under my microscope? Do the sperm die immediately after being exposed to the air? Are they not fully developed? How could I possibly see them under my microscope without having to be a scientist who looks at sperm before using them for artificial insemination? Please answer this question, because the problem is making me frustrated.

A: You're to be congratulated for wanting to learn more about this important ingredient of the reproductive system on your own. I'm not a scientist, so I can only guess at your problem, and my guess is that your microscope isn't powerful enough to show you something as small as sperm. Why don't you ask a science teacher at your school? Perhaps the school's microscopes might have the power you need and the teacher would give you permission to make your observations there.

Q: I have met a man who says his penis is 10 1/2 inches long and 5 1/2 inches around when erect. He is not circumcised. He says that he can slide his penis inside the uterus and make me have wonderful orgasms. My question is: Can this hurt my uterus? He also said that since I am only 5 feet 2 inches, it might not be possible to have intercourse, since I am not long-waisted. Is this true?

A: The cervix is the opening that goes from the vagina to the uterus. Under normal circumstances, when a woman is not nine months pregnant and about to give birth, it is very narrow, and even a small penis couldn't penetrate it, so as far as that goes, I think he is full of baloney. And if you haven't seen this penis of his, I'm not sure I'd believe that, either. He might be bragging just to get you into bed. In my opinion, you shouldn't give in to your curiosity, but simply cross him off your list.