it can be just about anything... Superheroines in distress works well, sci-fi, woman vs woman, woman vs monsters... whatever floats your boat. From what I've heard gay porn sells well too even though it's not my thing. Basically, go with what you like. If you have a fetish, odds are tons of other people have the same one. And in a way yes, I think Poser porn is becoming a fetish of it's own