you could articulate that idea as "how far removed is this from standard human behavior" and certainly it is weirder to have a fetish for floor tiles than it is to have a foot fetish
for the monster it depends because when you go into real non-humanoid xeno or truly eldritch monstrosities, that's quite different from some humanoid with antlers or a couple tentacles, you have there too the departure from normative bodies (tentacle monsters are just a bunch of bdsm penises so they're more acceptable)
>>34521kuon baby rp'ing with elle? double bab