Let's share a few links. Guidelines, sex or nudity related and free.
Here are two that I check regularly.
Favorite links
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sexuality.org - a hypertext Encyclopedia Britannica of really important stuff.
bawdylanguage.com - Short on dirty pictures, but lots of links to funny and informative sex writing.
The Expresso Tilt Penis Page: Just go: missioncreep.com
I almost forgot: retroraunch.com