I am not asexual but sex is not of particular interest to me. Every now and then, I'd crave a little physical interaction with another person but it's easily overcome. I think perhaps I rationalize it too much. Also, my partners did not make it easy for me to enjoy it. The "cuddling" afterwards would get a little suffocating. I, personally, don't understand how sex immediately translates into emotional intimacy. Maybe people just automatically make that association now. I would even make it explicitly clear to them that I was only interested in what they could provide me physically, and I always had their consent prior to it, but they seemed too willing to try to connect to me over a period of time. It bothered me, because then I had to explain to them again that I wasn't interested in developing a relationship (I hate repeating myself).
I have no preference for a single sex or gender. If a person appeals to me (not really emotionally; mostly intellectually), then it does not matter whether they are male or female. However, at the moment, I can honestly say sex is a mundane thing I think people make too much of a big deal out of. Yes, great, I have a sex drive but it doesn't govern my every thought and action.
I also think marriage to be a doomsday regime. I can't help but feel it's a little pointless, at least for someone like me. I have no disrespect for others who choose to marry. Live and let live, right?