I’m nearly 50 and being nearly 1.5 years into my transition, and my sexual attraction hasn’t changed. I still have zero interest in female partners. I just don’t find women sexually attractive.
While I do believe that for some people, their sexuality is fluid, just as some people’s gender can be fluid. However, for others, we’re born with just one attraction that never waivers. I was never even bi-curious when I was younger.