I do it constantly. I get good traffic and I think it has helped my PR a little. However make sure you have many times as many links from other mainstream sites as from adult sites because Google sees the location of links to your site as indicative of the type of keywords to assign to your site. For example, a few years back when I was still doing free sites I used my jokes site as an "exit" link on the warn page. At that time I happened to be doing a lot of oral sex and anal sex sites, and I found that over 95% of the traffic sent to the jokes site was for people searching terms appropriate to oral and anal sex.
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