When I was starting middle school, I was into guys and only guys, and was somewhat of a homophobe. (Though, I would see a woman and think 'Dang, she's hot.' Or catch myself starting at her chest and scold myself. "You're not GAY!" Funny thing is, I'm still not.)
I was "bisexual" up until about 10th or 11th grade. First, it was a lean to guys, then a lean to females. It changed from time to time. I have some of the most fluid sexuality of anyone else I know.'
By the end of 10th grade, I was "butch lesbian." Not man-hating, just never really attracted to them. And if I was, it was only for their looks. I rarely felt a strong emotional connection like I did with females.
A year ago this month (April 2014), I came out as trans*. Now, I only date women. Cis and trans* (post- and pre-op). I feel too dysphoric and self conscious to sleep with anyone, let alone anything that meant penetration on me. I don't find men's private parts attractive in any way (unless it would be my own). I tell all my friends that "I want a dick on me, not in me." I'm definitely heteroromantic. I only really get emotionally into it with girls. Bisexual? Maybe. I see a guy and think "He's hot," but rarely do I want to take it further than a short stare.
I do believe that my coming out has helped me on my journey of only liking women. I don't want to be a gay man. I don't like butt stuff or other men's junk. I don't feel like a gay man. I'm a straight man. A ladies' man. Ya know?