to the anon asking about the large amount of sex-trafficking/rape prompts/stories/blurbs, im going to try and give you a real answer
one major factor, is shame
it's a largely subconscious thing, the fact people's sexual fantasies lean toward this aggressive often dehumanizing scenarios.
but its something that has been observed in people raised with very strict social expectations regarding sexuality often having rape fantasies, because it is a way to indulge in their sexual feelings without having to admit to them, in a way.
i, personally, am fat and queer. and while never stated outright to my face, the fact that small children have on several occasions began crying while looking at me in the supermarket line, I would also have to assume im not that much of a looker either
any show of desires for intimacy, physical or emotional, has been laughed at. people asked me out as a joke when i was in school, my father's side of the family openly lamented my appearance since I was a child because my only real value to them was continuing the family line, and that's not going to happen if I'm unattractive and fat
the fact is I have been told my entire life that me being wanted was impossible, if anybody desired me they would keep it a secret out of fear of ridicule, and anybody who would be open about it must have a specific fetish or be using me
I want to be wanted, hell there are times I'm desperate to get catcalled, because that proves somebody finds me attractive enough to express that. (even if the reality of it is objectifying and rude) the basis of these sorts of fantasies are often rooted in being seen as so desirable, so wanted, that any and all restraint goes out of the window. (you know that romance trope line that's like, "are you sure? because once we start i don't know if i can stop." same idea) the tendency towards trafficking and sexual slavery are also rooted in this, but with the added bit of "see, somebody wants me so bad they will spend money on me, to own me. they will fuck me in a crowded room without shame because their desire for me isn't something they're ashamed about, i am a prize, and the fact they get to fuck me is something they will gloat about."
one of the major appeal of monsters is that they wouldn't be bogged down by our social expectations, or they would have ones of their own. there is no fear regarding being wanted despite my looks, because the things about myself I have been told make me unattractive, are things that they openly and voraciously desire. Also, for the fat folks in the chat, wanting to be picked up and tossed around by your partner is largely something we can't have, (BMI is bullshit but mine is nearly double what it "should" be) you don't have to worry about that if your partner is an 8+ foot tall creature that can suplex a sedan
so while in reality, me being stocky and fat is seen as something that makes me unattractive, a werewolf would look at me and go "ah, yes, broad as a brick wall and twice as thicc, he can take it in a tumble."
can you see where the overlap occurs?
obviously there are some generalizations and assumptions based on my own biases here, and everybody's got their peculiarities, but these are themes I have seen throughout my many years too many online
I also just think monster fucker spaces are a little more open to taboo kinks. like wanting to fuck a werewolf who could kill you at any second is already weirder than most people want to go. thank you for sharing your perspective anon.