"Different strokes for different folks" is the succinct answer.
No, unfortunately it's just the succinct
lack of an answer. It doesn't answer anything, i.e. you might as well use it to explain why a guy decided to kill a lot of people riding bicycles in New York a few days ago!
To expand, there are all kinds of sexual fetishes.
Almost the same answer, still doesn't explain anything.
Most people with a particular fetish for dominating an unwilling sexual partner can get by with role-playing (with controls, including "safe words," in place), and they probably don't need to do so every time they have sex. Crossing the line to true coercion or rape would probably be as repulsive to most of these people as it would to people who don't enjoy that fetish.
And now we're getting somewhere. We had a very long discussion about sado-masochism in the JREF forums about ten years ago (I've tried to find the thread, but couldn't), and I think that most sadists really don't want to hurt their sm-sexpartners, which is why they agree on safe-words etc. before the act. (Why they enjoy the
fantasy of hurting and humiliating them, however, is another story.)
Lines have to be drawn somewhere, and attempting to prove some of the subtler forms of coercion would be virtually impossible, even if the repulsion was as universal as you imply.
Yes, that is a given, in as far as the different kinds/levels of coercion
exist, but what I find very hard to understand is why anybody would enjoy having sex with somebody by exposing them to
any kind of coercion, even
"the subtler forms."
And, no, I don't imply that the repulsion is in any way universal, but I don't understand
why it isn't, i.e. how people can enjoy having sex with somebody who's been coerced, subtly or not.
Let me try to explain it in a different way: In our society, people are coerced to do all kinds of things that they find unpleasant, distasteful, harmful … Having exhausting, boring, backbreaking jobs, working for the minimum wage or even below that, is something that people are coerced to do by having no other way to support themselves: otherwise they won't have food on the table and a roof over their heads. But the people who exploit them are so far removed from them that they don't even have to see them or know their names, and this is probably how they prefer it: to be in denial.
But that is obviously not the case when we are talking about sexual coercion: Cosby, Weinstein, Spacey. On the contrary, the relationship couldn't be more physically intimate!
And I can't imagine that the majority of the human race or the majority of the male sex enjoy (or are even
able to enjoy) having sex with a woman (or man) who has been coerced.