[Westbrook]

The correct term is, “transvestite”, or “cross-dresser”.

You are correct about gender being a grammatical term, and that nobody can transform their sex.

It’s in the chromosomes, which cannot be changed from one sex to the other.

That’s science.

[Hiddigeigei]

"The correct term is, “transvestite”, or “cross-dresser”."
Some of the more serious can be referred to as "eunuchs."