Young Gay America — A project run by gay youth for gay youth. Resources, finding people in your area, and support!
The soc.subculture.bondage-bdsm FAQ list — Everything you need to know (and more) about bondage, domination, discipline, submission, masochism, sadism, and too many other things to list here. No pictures, just lots of info.
Lesbian.Com — Something for every dyke!
Lesbian Safe Sex — Thorough information for lesbians and women who have sex with men. We can stop the spread of HIV. Do it.
Our Whole Lives — This sex education site is informative and easy to obtain information from, recommend for parents, educators and any one who is interested in enhancing the knowledge we have of our sexual selves. "Our Whole Lives is a series of sexuality education curricula for five age groups: grades K-1, grades 4-6, grades 7-9, grades 10-12, and adults."
Technical Virgin — the funniest teen-abstinence parody!
Safersex.Org — An excellent resource. Everyone should go here once in their lives, no matter how much you think you know.