No, this isn't a post/thread about porn that actually takes place underground (although...), but about relatively undiscovered niches that don't get much exposure or sponsor support.
Given Greenguy's post about his new tan-line category on link-o-rama (
http://www.greenguysboard.com/board/...55#post302255), I'm wondering, are there any other niches you wish more sponsors would promote? Any particular likes not getting their rightful content?