Hetero as the day is long.
It used to make things awkward for my male friends, because I ended up interacting like them as if I was sort of like their girlfriends (they used get annoyed with me, and say, "quit acting like you're my mother!").
I only had one relationship with a woman (back in 1990 - I was 27 at the time), and even that never would have happened - a very good friend of mine and I were both playing in a band (I played lead guitar and sang, and he played mainly rhythm guitar and sang), where he put me on the spot about a female band member. It turned out that she had been sending me signals that she was romantically interested in me, that I completely did not see (or ignored - one of the two), and out of frustration she told my friend how she felt about me. He told me about how she felt, and said "hey what are you gay? pursue a relationship with the woman (sic)." Feeling trapped I went through the motions of a relationship with the woman. It didn't go very well. Most of the time, it was awkward and uncomfortable (what little sex we had, was a disaster), and she began to realize something was up (I remember her telling me that she thought I was hiding something [I lied through my teeth, denying that there was something unusual about me going on]). The woman and I drifted apart after 4 or 5 months, and the relationship ended (thankfully).
I'll state the same thing I told the members of a transgender group I belonged in 1999, during a chat about relationships. At the time, I was beginning to realize that those of us who are hetero are probably in the minority, and I said, "sorry, I realize that I'll probably always have a harder time of things romantically (as a Gen Xer, most men my age are not very accepting of women with a transsexual past), but I still very much prefer men. That's just the way I am."