The Thinking Woman's Guide to Buttfucking — by Greta Christina. Excellent and informative essay, fun to read.

Anal Sex? "Yes!" — anal sex links, first-hand accounts, and advice.

Anal Sex — information and advice from the Sexual Health InfoCenter.

Ten Rules of Anal Sex — by Jack Morin, author of Anal Sex and Health: A Guide for Men and Women.

Advanced Anal Sex Techniques — from The Society for Human Sexuality.

Anal Intercourse and Analingus — information page from Elf Sternberg.

Anal Advisor — column from Tristan Taormino, author of the Ultimate Guide to Anal Sex for Women.