

Ask Uncle Terry
A thorough, well crafted site with solid, down-to-earth information.
For Divorced Wives
This is an excellent site for women who are divorced or thinking about it.
Foreskin Tight?
This appears to be an excellent forum for guys who feel their foreskin is too tight. The advice helps deal with the problem without resorting to circumcision, unless it is absolutely necessary. Unfortunately, in the United States, "absolutely necessary" means "just about always," where in Europe, they are hesitant to chop off a foreskin unless it really is necessary, and that isn't very often at all.
General Sex Info
"This site is run by students doing advanced course work and research on sexuality through the Sociology Department at the University of California, Santa Barbara. One of our main goals is to reach people around the globe who want to learn about human sexuality. We also strive to compile information about sexuality in a way that is both informative and personal, meeting all of our viewers' needs."
Mensstuff.org
Gordon Clay has done an amazing job of transforming his original Men's Resource Hotline into the quarterly publication of Men's News, and that evolved into the Mensstuff website. This website was the first in the country to run Paul's weekly column on sex that had its print home at the former Colorado Daily.
Vaginismus (Vagina is "too tight")
An absolutely excellent website for couples where the muscles around the woman's vagina become so constricted that nothing can fit inside. This is called vaginismus, and the causes can range from a fearful visit to the gynecologist or a clumsy sexual experience to something as tragic as rape or abuse.
What Nerve!
Nerve.com for writing on sex that is often insightful and intelligent, and that's saying a lot when the subject is sex. You'll need to pay the piper for a premium membership to see the really cool photos.