How about this. I find myself, very often, filled with "ew" at guy on guy. It does not do it for me, never will. In a sad correlarry, and yes, straight male entitlement, I find woman on woman hot as fuck, even though that's a sign of them not wanting any, er, help. Yes, maybe I am homophobic, I don't know. I can't control my gut reaction of "ew."
What I can control is my response. I will not say "ew" to any gay male couple's face (hell, I'll probably leave it in my tiny brain where it belongs), I will fight for their right to have PDA in a decent manner as any straight couple, I will fight and support love in all forms, and I will also never accuse women of being affectionate towards another woman just to pick up guys.
Just my thoughts and all.