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.
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.
The following tags implicate this tag: sexy_no_jutsu.
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