Some good sites for information are:

http://www.libida.com/content/howto...=2&id=113457131 6

http://www.clitical.com/anal.php (in the Main Menu in the left-hand column on that page, click on "how to"; there are 2 articles on anal sex in the how to section).

The thread Lilith referred to also mentions this site:

http://www.puckerup.com/anal_advisor/anal.htm (it's exellent)

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