I don't think there is an objective definition.
Some in this thread say that taking it in the shitter from a TS is gay, but technically simply looking at a large TS cock and getting aroused it by or simply admiring the aesthetics of it is gay, since it's a male organ and in some way representative of gayness. IMO it's silly to say that some acts are more gay than others, it's our Western pop culture that links anal sex to homosexuality.
That said, I think liking TS' is a shade of grey. Most who do simply like the mixture of a cock and a female body shape/figure, so it's not exclusively gay or straight.
|