I actually disagree with the general claims made above that transmen are just like cis men. Yes, in a variety of ways, we are the same as men assigned male at birth. But our history IS different, and that's relevant to this question, in my case. For instance, at one point I identified as a lesbian. At this point, I don't identify that way, but it doesn't mean that I don't find lesbian sex hot. In fact, I find it hotter than I do straight sex a lot of the time. After all, I learned to have sex as a lesbian. I still currently sleep mostly with queer women. So my sex hasn't changed all that much from the sex I was having when I was a butch lesbian. With that said, the sex I find erotic hasn't changed much since I was a lesbian, so girl-on-girl is still hot.
I should emphasize that this is my opinion, and I don't mean to suggest that other transmen's sex is anything akin to lesbian sex--that's just my sex life I'm talking about.