You're falling for the language agenda of the left and of the homosexuals by thinking of gender as your sex and the word sex only as the act. That's what they want. Once you accept their definition of gender to replace the definition of sex then all that's left is to settle on how many genders there are.. But there will be a never-ending number of genders, like NAMBLA as a gender.
I suspect this trannie thing is a stalking horse for letting men get at little boys freely.