They are wired up wrong.
Mutents.
With all forms of life, the driving force is to reproduce.
You don’t achieve that up a blokes arse.
Once that is accepted then I’m sure we can all agree on letting them live their lives.
Deny it, and try to pretend it’s a lifestyle choice, then we’re never going to agree.
Of course, whatever way they want to live, they can’t change from one gender to the other.
Whatever they have cut off.