This is a great comment, covering all the bases of what I was going to say. I'll just add that dub-con includes outside influences 'making them do it' ie. drugs, alcohol, sex pollen.

But really, fandom is that playground, as you say, in which people can explore those little fantasies. It doesn't mean that it's going to happen in real life ("end up enjoying it") or that having sex with a partner who's drunk is ever okay.

So, in other words: THIS.