I think the issue is mostly bad implementation. Bottom line is, despite what a few very vocal people say on a piracy site, Lesbian porn is still...even now...one of the top three popular forms of porn in the world. That kinda makes the vocal folk around here a very, very, very, small, annoying minority.
So how do we fix the implementation? Well..given most of the AVN's are written by people who have never had a relationshop (I imagine)...it probably isn't going to change. When done properly, it's great and seriously, even in real life, who cares if your straight wife fucks her best friend? Like...really? Some people are too insecure.