I remember back in the day that one of the best sources for online marketing and SEO tips was a porn webmaster forum or mailing list - can't remember the name of it though - and one of the tips was to, instead of linking off to Google or Disney for U18s, instead create a sports themed site to monetise.
I find that hard to believe - mainly because it's impossible to believe anyone actually clicks that link. Heck, I'd bet half aren't even links, just text (only kidding!).
