I have to second what ftmax has said here, I think I may have noticed that myself. Since transitioning I have only really "dated" or "been with" two other trans women until three days ago when I went on a date with a cis girl. I am a monogamous type, and it's not like I am flippant with my interests at all when it comes to intimacy. Usually when I become interested in someone, it is because I can see a future with them and has very little to do with sex. Anyway, I ran into some tough emotional situations with one of the trans girls due to the conflicting dysphoria theory ftmax mentioned. It seemed great at first- almost perfect! ...because as trans people we inherently share so much in common and face a lot of the same issues. However, ftmax is right... We all cope with the issues differently, have different timelines, different triggers, the list goes on.
Lately, I've been feeling more attracted to the idea of trying to date a cis female again, and I wasn't sure quite why. The aforementioned does kinda click in my head. As if I was already thinking it, but hadn't been able to put it to words.
Thanks for helping me possibly make some sense out of it!