General Encyclopedias

All About My Penis
The story of one man's penis and testicles, relating his experience of penis size and health, masturbation, sex, making love, with information on male sexual health, orgasm, and ejaculation.
http://www.my-penis.org/

All About My Vagina
An extensive site covering all aspects of the female genitalia.
http://www.myvag.net/

History of Sexuality
A time line of sexuality information from pre-history to the recent sexual revolution. Includes a message board for topic discussions.
http://www.historyofsexuality.com

Sex Dictionary
A glossary of sex words and phrases listed in alphabetical order. Viewers can also submit definitions.
http://www.thesexdictionary.com/

Sexology Professor
An open-content dictionary of sexually related terms.
http://www.sexologyprofessor.com

Vagina Vérité
Articles and discussions exploring a variety of vagina and vulva topics.
http://www.vaginaverite.com/