If your adult site has an Adult Warning interstitial or front page ("Do not enter if you are under 18, don't like naked people, live in Topeka, etc.") with a "NO, I want to leave this site" link option as prominent as the "YES Enter Now" option, instead of sending the No traffic to Google or Disney.com or whatever as so many do, link to my mainstream site,
http://www.dailpayitforward.com
In return, I'll give you a return link, above the fold, from your choice of Manpuppy.com (gay) or ThePronx.com (straight). Both sites are PR1. (To see the placement, check out ManPuppy.com, where the links for Gay Porn, Click 4 Porn, & "mobile porn" are. These links are expiriing soon and your link could take their position.)
You don't need to change the anchor text or image for the NO link, just redirect the traffic to DailyPayItForward.com.
Limit 15 characters for your return link anchor text, only accepting sites with minimum PR1 and 10,000 Uniques per month. Reply in this post with your e-mail address and I'll check once per day until all positions are taken. Cheers!