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Japanese: 性転換
女体化 is used only for male-to-female genderswaps.
男体化 is used only for female-to-male genderswaps.

A "genderswap" refers to the almost magical version of a sex change, wherein a character of one gender turns into one of the other sex without any medical involvement.

This tag can also apply to an image of a character of one gender depicted as one of the opposite sex (e.g. a male version of a female character or vice versa). May also apply to male-to-futanari, but since futanari is not wholly female, female-to-futanari may also qualify. A being with not gender depicted as any of these may technically count.

This tag can also be applied on traps if the character is given female traits such as the presence of actual cleavage or the obvious absence of a bulge at the crotch.

If a character is genderswapped often enough, the genderswapped version may be given its own name. For male-to-female genderswaps, this is often the normal character's name with "ko" appended to it. (子 "Ko" meaning "child" is a common ending for Japanese girls' names.) For female-to-male genderswaps, "o" is sometimes added.

Known in Internet circles as Rule 63, wherein there is a female or male version of any given male or female character, respectively.