Having had a few bisexual boyfriends and not possessing a cock myself, I have no problem with a s/o enjoying this site. If he were secretly on here - I might have a problem. But if he openly enjoys other men, I don't care and in fact like to talk to him about what we see, admire and enjoy about other men's bodies. And if he jacks to to other guys, well, it's better if I can watch him do it
However, most of my r/l friends wouldn't agree with me. I've often been told by friends that they hate when their men watch any porn, much less just be a part of a site like this. And any same sex stuff? Definitely not.
I think most of the women here are much more open and nonjudgmental when it comes to sexuality of both sexes. LPSG attracts women who are pretty open minded.