Rule 63

Rule 63 is a meme among the "rules" of the Internet

"For any given male character, there is a female version of that character."

and, conversely, "For any female character, there exists a male version of that character."

Some people believe that androgynous characters are the exception -- these people are blissfully ignorant of the amount of Bridget fanart porn that exists. Jesus Christ. Due to a funny habit in the English language of using 'he' and 'him' as default pronouns, there's plenty of artwork of monsters and objects that have no determinate gender that are Rule63'd into having human-female characteristics like tits, narrow waist, or just long hair and wearing a dress, bashfully hiding her nucleus behind a not-yet dissolved fan.

Rule63 doesn't require that the opposite-gendered versions be in porn, though that's fine too.

Examples

Here are some:

Gallery

This is not a place to upload anything and everything Rule63 related; this is just for images already used on other articles. And try to keep this gallery worksafe.