They look exactly like hot women, and they make out with other hot women. But they're actually aliens/immortals/bodysnatchers/etc. So it's not really gay, right?
Discount Lesbians are canon homosexual characters and couples who are either not human to begin with, come from alternate realities, have been magically or technologically altered in ways that affect their sexuality, etc., so that they [...] [tvtropes.org]