Sissy

A person (male or female) who engages in being feminized as a kink. This can also include being humiliated in order to reach a different emotional or mental state.

A Sissy is submissive to their partner.

While many people have a sissy kink and play with this dynamic, many others are offended by this term because of the potential for misogyny, reinforcement of gender stereotypes, and potential to trivialize of fetishize transgender individuals.