Anything and everything is possible in samsara. Just as when Mr. Garrison in South Park had a sex change and (s)he found out that (s)he is a transgender lesbian, I bet there is such person in real world too.
Actually, back in the mid-eighties, I read an interview with a transgender lesbian. They were married, as a man, to a woman and then decided to become a woman. They had the sex change and realised that, as a woman, they were sexually attracted to other women and thus remained happily married to their original wife.
With the eye of wisdom we discover a lot of anger in us, any amount of jealousy, resentment, ignorance, desire - mountains of emotion whose existence we would never have suspected in ourselves... We recognize that most of the faults we perceive in others are only the mirror of our own negativity, the reflection of our own disturbed feelings... At the same time, we relieve the world around us of the burden of our own negative judgements."
Gendun Rinpoche Heart Advice from a Mahamudra Master