The same way plenty of people who assume are straight end up somehow realizing later down the line that they have fallen for someone of the same sex.
MOST lesbians have been closeted at some point and had sex with men, before they got out of the closet in an effort to either fit in or hope they were straight. (Me included).
If you have ever been through a coming out journey, then you would understand that the brain is a powerful thing and sexuality not linear.
I have never enjoyed sex with men, never wanted to date them and I have never missed it (nor them). So, the stakes are low. But I don’t consider Transwomen men. In that there is a massive difference between a man that identifies as a man and is a gym bro and a transwoman who has gone through multiple surgeries and might very well look more feminine than me.
I will never feel attracted to the gym bro but could at first sight be attracted (I assume) to the second one. Similarly I am not attracted to butch lesbians (masculine lesbians) nor would I be attracted to a trans man because they are too masculine for me (despite them being born with a female body). Would I be reluctant to have sex with someone with a penis? Absolutely.
BUT like I have said, I have gone through enough in my journey to know that I can’t exclude it fully from the realm of possibilities because I am also not dumb enough to deny myself the possibility of being happy IF my happiness was to be found with someone trans.
I find it a lot more odd to exclude anyone from the realm of possibilities. The same way I am a lot more into brunettes and like I have said feminine women but if tomorrow a blonde masculine woman steals my heart, what am I going to do?
So yes, I am a lesbian. But I am also human and open minded, and open to loving who I love. Currently I have never fallen for anyone who wasn’t female. Could it change? Who knows. I don’t know and it would be crazy to act like I know what my future would look like.
I am okay with the realm of possibilities that someday somehow I might end up loving someone who isn’t female, even though it naturally sound crazy to me right now, because it’s definitely not the worst thing that could happen to me and so I don’t see a need to frame my mindset 100% against it. I won’t go looking for it but I have spent too many years of my life fighting against what I naturally feel and like and my sexuality and being terrified to love someone I am “not supposed to” to want to try and do it again in the opposite way. Whatever happens will
happen and I will be fine, I am confident enough in my sexuality to not feel the need to fight against anything tbh.