I would build a community blog where people could make blog entries to your site that describes a site, movie clips or pic set that they have. Could even be a blog entry about their favorite phone sex service, sex toy, etc. Linking could be one to one or link from the root of the domain that actually has some juice. This is assuming the blog submitters know a little seo and how to build internal pr. Not that pr has as much weight as it used to but it might still help a little.
Then I would start my own adult social site (twitteresque) and add the "like" button feature. Do you need more details or can you follow it from there?
(I see Ramster has stolen part of my idea already)
