What it is is the relative lack of boundaries in the LGBT community. I suspect it has to do with the overtness of sexual display as a response to having one's sexual orientation be oppressed decades ago that turned out to be a horrible overcorrection. What (I believe) most of the homos on here exercise is consent, not just in regards to blatant sexual activity or visuals, but also in terms of talking about sex. For all the talk about boundaries, it's very easy for someone to talk about NSFW stuff in public (
Contino comes to mind) that makes many people uncomfortable.