That really does not address my point, though. Let's take sexual orientation out of it with an example.
Let's say couple A is really into BDSM. Let's say that Couple B is not, and it is even a turn off for them. Couple A says "No problem, we like regular sex just fine." Couple B then says, "No, you guys are into BDSM, therefore, we feel uncomfortable playing with you, even if you promise no BDSM."
I know plenty of women with zero interest into sex with other females. To a one, they are willing to play with couples where the other woman is interested. This is about guys not wanting to naked in the presence of a bi guy. Do I call it "homophobia"? I am not doing that, but there is some level of discomfort that stops them from wanting to swap with a couple where the guy is bi. What if they are in separate rooms? They still are unwilling to play with them? It is not something rational. It is some sort of hang up. And it is a double standard. Gay men and bi men are simply less acceptable to Americans, even in swinging. And if you don't think there is a anti male-homosexual bias in swinging then you have not been paying attention.
Again, I am no longer willing to lie and say I am 100% straight, that makes me uncomfortable. If some man is uncomfortable having sex with my wife because I am bi, neither of us want to play him or his wife.