Well I'm not sure I get why a "gay transvestite" would want to change sex?
If she means they're a gay couple, with her being just very effeminate, then of course the partner isn't going to want her to become a female. He may love her being feminine, but a gay man won't want her to be FEMALE. And I'm not sure why SHE would want to be female if she's really an effeminate gay man?
And if she's really a TS, then she may not have much choice. Her GID will dictate what she has to do to.
~Kate~