Good question elio,
Well i have to be and amateur as i haven't had a cock yet, but ive been desperate to taste one and be fucked be one for the last couple of years since my interest in shemales began.
i reckon i would love cock in my mouth, since a good half of the joy of the sex act is in the fantasy, in the mind, and i like the thought of a cock in my mouth, and my arse.
i m not actually sure i will enjoy it that much when it really happens, who knows, but i sure need to try it soon!