I was wondering about the depth of the vagina. I've read statistics that say that the average vagina is only 3 to 4 inches deep. This seems way too small to me, since the average penis is considerably longer than that. Wouldn't that mean that most penises would crash into the cervix repeatedly during intercourse? Since this obviously doesn't happen, my question is this: does the vagina actually elongate during intercourse to accommodate the entire length of the average penis?

Dear Alice, 

I take Valtrex daily to protect me from cold sores I get on my face. I haven’t had one since I started taking it a few years ago. My partner gets cold sores on his mouth and has recently performed oral sex on me while having a cold sore. Will the daily Valtrex protect me from developing genital herpes? How will this affect me in the future?

What are the risks of HIV infection for the passive partner of oral sex?

If one has a long-term partner and neither AIDS nor any other STD is a concern, is there any medical reason not to perform cunnilingus on a menstruating woman? My significant other is particularly horny during her period and would love cunnilingus at this time. I am willing but curious.

I am curious about double penetration (two penises in one vagina). Because of the increased friction, even if both men are wearing condoms, is there more of a risk that the condoms would break?

I currently use NuvaRing for contraception. Because the ring slowly emits hormones into the body via the vagina, my partner and I are wondering whether he will have an unhealthy amount of contact with these hormones during oral sex. Thanks.

I am a well-adjusted late twenties male with a steady girlfriend. Lately, I have been increasingly fantasizing about various types of anal penetration. I have discovered that during masturbation, this brings me very intense pain/pleasure. Even though I think it may be satisfying to experiment with a vibrator or other objects inserted by my girlfriend, I find myself drawn toward trying the real thing (i.e., having anal sex with a penis). The problem is, I definitely do not consider myself homosexual and, in fact, the thought of the actual act with another man actually repulses me. Am I trying to have the real thing without going through a bisexual experiment or what?

I'm wondering if washing immediately and throughly after intercourse helps prevent pregnancy.

Recently my girlfriend and I purchased a home pregnancy test and it came out positive. Four days later, we were sitting in a clinic awaiting her name to be called for an abortion. My girlfriend wouldn't hear of any idea but going through the process as quickly as possible.

Throughout the entire experience I tried to be as supportive as possible, taking as much care of her and giving her as much love as I could, and in the meantime suppressing as much of the stress I was under as I could; she has even told me that I was 'perfect' throughout the whole thing. The period following the procedure, though, has been a roller coaster ride: she was subject to mood swings, going from a state of total bliss in my company to practically despising my existence.

She told me she wants time away from me. She is convinced that an experience like this (an abortion) irrevocably changes a relationship. She is pro-choice, but this abortion has affected her more than she expected; she cannot shake the feeling that she killed our child — she has even dreamed about the would-be baby...

Now, I understand that an abortion can bring a person to her emotional knees, regardless of how she might have thought about it previously. But here I am witnessing her shutting me completely out... and I ask myself, is this how it has to be? I love her very, very much — she absolutely means the world to me. She has repeatedly let me know she feels the same about me. How do people deal with this crisis? Is this common? What are the resources available for CU students, post-abortion? How do I convince her that this doesn't have to be the undoing of our relationship, or am I wrong in believing this fate can be avoided?

I have encountered a problem I never expected; my boyfriend is quite simply very large. I am unable to perform oral sex except for the first couple of inches due to the girth, and vaginal sex is not totally satisfying for him because he is too long and cannot fully penetrate without causing me significant pain. I've seen my doctor, and am reassured that there is physically nothing wrong with me — no infections or scarring, but am finding it difficult to come up with a solution. Any suggestions?

Some of the girls at my school talk about how their boyfriends got to first, second, or third base with them. I feel kind of left out because I don't know exactly what they are. Could you tell me what the bases are for girls and guys? I'd really appreciate it.

I am just curious about sex, and why is it such a turn on?? Is it the physical contact or sexual actions?? Or is it endorphins spreading through the body while it is happening??

If my partner and I have been monogamous for three years (and I was a virgin before we met) and my partner tested negative for the HIV virus (twice, about two years ago, with a six-month gap between the tests) is it safe for us to use a birth control method other than a condom? That is, are there still any STDs that my partner might have without knowing it, that we should be worried about, even though nothing whatsoever has seemed wrong with either of us for three years and my partner has had several regular annual physicals in that time?

Is it possible to get sick from oral sex, when your partner doesn't have any STD's? I've only ever had one partner, and recently I performed oral sex on him. Only ever since I have had a sore throat, and swollen glands. Is this related, or did I just pick up cold germs he was carrying?

After you have sex, how long should you wait till you do it again?

If a man is performing anal sex, can he actually feel his partner's waste products? Please answer because I read somewhere that the proper thing to do is perform an enema first and I can't believe this is true.

I am really nervous because my period is a week late so far and I am studying abroad in Egypt. I really don't know who to talk to about this. Premarital sex is a big taboo, abortion is illegal, and I can't even find a pregnancy test at a pharmacy. What should I do? I can't come back to the U.S. with a big belly — I can't tell my family! I am so afraid! I left the U.S. a month ago (my partner is still there). I read that jetlag can influence your menstrual cycle, as can weight gain or loss. I was jetlagged, but my weight is more or less the same (except I am eating more rice and oil than I do normally). Could diet change your cycle? Anyway, I guess my main question is, what should you do if you find out you are pregnant in a conservative country where abortion is illegal and don't have enough money to fly home and back? Thanks.

I am nineteen-years-old. I just found out that I'm pregnant. I have been with the guy for two years and in college for one year. We are not financially stable. We have given it a lot of thought, but still do not know what to do. I have looked at the pros and cons and still I'm not sure. I have three little sisters and know that raising children is a hard job. Throughout this time I have leaned more toward the abortion, but don't feel like I know enough about it. Can you please HELP?

When my girlfriend and I have sex, we almost always (nine times out of ten) orgasm within a few seconds of each other. Honest! This has been happening daily, with the exception of her periods, for about six months. We are both quite satisfied with each other as sexual partners. Are we an unusual couple? Thank you for your time.

I see that in several messages and answers, that reference is made to oral sex accompanied by the use of ice cubes. I'm pretty ignorant about this and would be very grateful to you if you would tell me more about this. My boyfriend and I have a very good sex life and we enjoy making love, but we're also on the look-out for new things to try. I've asked my friends about this and some of them thought it was a joke! Thanks for the help.