I suppose that I was bisexual before. Although, I didn't really get a lot of experience one way or the other I experimented in both directions.
I found my wife attractive, but when I was with her, I switched places with her in my mind.
There was a gay man that liked me a lot when I was pre-op and I gave that a try and it wasn't for me. I think that I was too distracted by my own body and he wanted to be with a man.
I did have a brief relationship with a straight man while I was pre-op and somehow that was completely different. He was willing to wait for me through SRS and everything, but I ended up breaking it off. I think that I needed to be unattached for a while.
In the end, I view myself as mostly hetero. That is, I am really only interested in men - my husband these last two decades.