transvestite

noun3

1. •
   A person, typically a heterosexual male, who compulsively seeks and derives paraphilic sexual arousal from cross-dressing, especially if the urges and behavior cause the patient distress or social impairment.
2. •
   (old-fashioned) A person who sometimes wears clothes traditionally worn by and associated with the opposite sex; typically a male who cross-dresses occasionally by habit or personal choice.

   • Even though Steven used to dress up in his sister's clothes, it still came as a surprise he ended up as a transvestite.
3. •
   (old-fashioned) An animal that engages in sexual mimicry.