Also called "sissification", feminization is a type of fetish where the focus is on a man (particularly androgynous men) crossdressing and being groomed into behaving more feminine. Is often done as either an act of humiliation, as the result of hypnosis, or to establish dominance (especially in femdom relationships).
This term also applies to tomboyish girls being forced to act more conventionally feminine.
Note: do not tag all content specifically focusing on a male at birth character crossdressing or with gender questioning themes as feminization.