Dear Alice,

I recently had a routine HIV screening done for prenatal labs. It was positive. Thank GOD, western blot came out to be negative. My OB is reassuring me not to worry, that false positives sometimes come out in pregnancy, and as long as the western blot is negative — I'm negative. Could you explain a little more in detail as to why and if you agree with my doctor? I'm at very little risk otherwise and had a negative HIV test about five years ago and am with the same person (my husband).

The service that you provide is very informative. Thank you for it. When I have sex with my girlfriend and I thrust my penis deep into her body, she says that she can feel it hit something hard inside her body. I can't feel it hit anything. She is very curious to know what it is that I am hitting. Could you shed some light on this issue?

1) What is the average number of sexual partners per year for undergrads?

2) Do you know how many college students are having sex? Are there any statistics? I was wondering if it is lower than a lot of people would have you believe. I feel like I'm the only one sometimes who is not having sex. Thought maybe I'd see if it was true. Thanks.

My new girlfriend and I had sex for the first time this weekend. Later in the evening, she was curious about something... "Where is that thing going???" she asked. She mentioned that full insertion was painful and she wanted to know what I was hitting, and "how far does it go?" Being admittedly a bit rusty on my knowledge of the anatomy of the female body, I told her that I thought it went no further than the "uvula" (whatever that is), but that I would do a little research, maybe see what I could get off the Net and get back to her.

My boyfriend and I have sex almost daily and I usually get on top so my clitoris is stimulated enough for me to climax. But I've noticed that when I come after having sex every single day my orgasm isn't as great as the day before. Can my clitoris desensitize from too much sex?

Thank You!!