What they really want is the eradication of mankinds 'created condition" (male and female). In its place they envision a 'sexual continuum," which will include sex with babies, children, preteens, teens, same-sex, incest, orgies, beastiality, and whatever the thoroughly deviant imagination can conjure up.
It's really the idea of revolting against Nature with a capital "N" and the Author of Nature which excites them. It is a hellish appetite engendered by rebellion against the supreme authority.
That's why their sexual practices excite disgust and horror in normal people.