I'm with "hard2kill" on this one. First, I own several porn sites and have had no problem ranking well in the big G with any of them. Second, there was a guy on DP looking for links to his pharmacy site, so I gave him footer links on some of my "dead" sites (non porn) figuring there was no loss there anyway, and now those sites are actually doing BETTER in the search results than they were before. Weird, I know. I think it comes down to the amount of links you have. Link farms are bad. We've established that. But if you use a theme for your site that happens to have one or two links in the footer to what you might consider a "bad" site, I don't think any harm will come to you. Maybe it would be bad if you had dozens of bad outgoing links, but 1 or 2 wont make any difference. That's been my experience.
Thanks for your thoughts asmodeus. Hopefully you guy's are right and having the link in the footer of my site won't hurt it. I don't see it myself but hopefully your right.