When I came out, I became hornier. I'd had a low sex drive for years and didn't realize how much I'd been repressing. My ex loved it.
When I started T, I was even hornier, but I became orgasm-centered. My then-partner didn't like that; before T, he would get off all the time, but I would orgasm about fifty or sixty percent of the time. So he started having trouble with this change. He accused me of being selfish, of using him, because I started wanting orgasms as much as he did. I thought he was unfair and childish because with very few exceptions, he always had an orgasm when we had sex.
We had a monogamous relationship. I would not have jeopardized that by getting involved with someone else because the bottom line was that I loved him. So the sex was pretty important, but the love was more important. We did break up, though. Transition is hard on significant others.
People obviously vary, and transition tends to complicate relationships.
P.S. Ditto what Jigsaw said--pronouns can be confusing. If your partner prefers female pronouns, you might want to make that clear the first several times you post here, at least till people get to know you and your situation.