Well, I'm bisexual so I don't know if that will diminish the effect of my story. My relationship with my father was non-existent, and it never really developed into any sort of good place. I tried when he didn't want me, he tried when I was done wanting him to be there, then he had a stroke, developed early onset Alzheimer's and since then I've never seen him again.
But then again, my uncle and cousin (related through my mother's side) are gay and lesbian respectively, and I've always thought that it was more that it was in the family. Then again, my uncle and his husband were probably the closest things I had to father figures, so who knows?