to me there are three kinds: you have men, women and transsexuals.
I consider myself to be hetero, in spite of my experiences with ts. Over the past 14 years I had sex with 4 or 5 different t-girls (and it was making-love not plain sex) but sex was not the most important to me. I feel attrackted to ts perhaps because many are much more feminine than women, they have a better taste and understand better what a man likes, I read here "the best of both worlds"that's true but a well known easy quote.
Of course it also has to do with your own experiences in life. The more extreme things that overcome to you, the more you are open to remove/change your limits.
I knew a female prostitute for 12 years (and she was beauuuuuuuuuuuuutiful), we lived together for 3 years under the same roof and had (what I thought) was my son. After we seperated I started to check the "catwalk" in the red lite district in Rotterdam (which now no longer exists) to see if she went back on the streets and that's how I got "involved" in the transsexual world.
I don't know how to explain further, sorry English is not my mother language so I tried my best.