The mirrorverse in DS9 works on the exact same ruleset as the mirror in My Little Pony: Equestria Girls, but with bisexuality instead of bipedalism
a fascinating thing to me about the DS9 mirrorverse is that it doesn't make you gayer; it makes you more bisexual. garak AND kira are both bisexual in the mirrorverse, despite kira being straight and garak gay in the base universe