I used to be so asexual that I didn't even have any interest in anything to do with sex. I was even quite a visible figure in the community and as an activist for asexual visibility and acceptance. Well, about two months on hormones put the end to that pretty definitely.
I was always pretty sure that if I was attracted to somebody, it would be women I'd be interested in. In fact, even before I realized I was trans I did think that I might be sexual if I was a woman (and completely missed a pretty damn obvious clue about being trans, I was pretty good at missing those). It was pretty hard to deal with, actually, because it made me feel like one of those creeps who just gets kicks out of girls doing it together, even though I was extremely aware that I was getting the kicks out of the idea of being one of the girls instead of some kind of voyeuristic fantasy.
Here I kind of do blame society because female homosexuality is so fetishised to absurd levels that it's hard to approach the subject at all without feeling guilty about it. It's become easier as I start to accept myself as female more and more, I start to accept myself as a lesbian more and more. But still, it's something I approach with much caution, because the feelings of guilt are still there even though even my lesbian friends hammer to me how I shouldn't. But another part of it also is that I am keenly aware that very large portions of the lesbian community don't accept transwomen, either amongst them or as a concept in general. And even though I usually just do my thing and tell people to shove it, this time it's too sensitive a topic for me.
I'm probably going to wait until after my surgery in any case before becoming sexually active in any way in any case, so I'm still at least two years away from it. But it's surprisingly become one of the more tender topics in my whole process. I have to say that I would've preferred to remain asexual. Life was much more simple back then, even if I did have to explain what it is and convince people that it's really a thing.