For this week’s edition of Sex Question Friday, I’ve put together an updated list of the ten most read Q&A posts of all time from this site. These questions (all submitted by readers of Sex and Psychology) span quite a range of topics, but most are united by this theme: “What’s normal when it comes to sex?” What you'll see from the answers is that “normal” does not mean just one thing!

10. How many men and women shave their pubic hair? (Survey research finds that most men and women say they've done it at least once before--but people do it in different ways, with different frequencies, and for very different reasons. If you do any "downtown" shaving or trimming, be careful. Emergency room visits for pubic hair grooming-related injuries are more common than you might think!)

9. Do women become "loose" if they have a lot of sex? (Some women's vaginas may become "looser" over time, but not as a function of how much sex they're having.)

8. What percentage of women reach orgasm from intercourse alone? (Based on the research I’ve seen, about half of the women surveyed report this.)

7. What is the average penis size? (It depends which study you consult and who’s doing the measuring. For the most up-to-date view of the research in this area, check out this article.)

6. Can a man be allergic to his own semen? (It turns out that this can happen, and it’s known as post-orgasmic illness syndrome. Women can be allergic to a male partner's semen too.)

5. Do women enjoy anal sex? (Many do, and studies find that it is an increasingly common sexual activity practiced by women today. Although it didn't make this top 10 list, many readers have also been curious about how to make anal sex more pleasurable.)

4. Is deeper penetration better? (For most women, not necessarily—but for some it is. In fact, some women can reach orgasm from stimulation of the cervix.)

3. Is "rimming" safe? (Like any sexual activity, there are risks associated with this one, but also ways to make it safer.)

2.I want to watch my wife sleep with someone else. Is that normal? (Believe it or not, this is a surprisingly common sexual fantasy among men. For an even more detailed look at the research in this area, check out this article.)

1. Why are so many straight men into transsexual porn? (This is also a very common sexual interest among men and, contrary to popular belief, most men who are attracted to male-to-female transsexuals are not gay.)

For previous editions of Sex Question Friday, click here. To send in a question for a future edition, click here.

Want to learn more about Sex and Psychology? Click here for previous articles or follow the blog on Facebook (facebook.com/psychologyofsex), Twitter (@JustinLehmiller), or Reddit (reddit.com/r/psychologyofsex) to receive updates.

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