You're welcome, Luca. The most horrifying example I can think of was a comedian, Aziz Ansari. A woman went to his apartment, spent the weekend (mostly naked) and various sex acts occurred. She said later that she felt too intimidated to tell him there were certain things she didn't want to do.

Here's a link to some feminist verbiage trying to justify retroactive withdrawal of consent:

feministphilosophers.wo…

I think this is why the want to make consent be all verbal, when actual human sexuality involves a lot of nonverbal interaction - then they can play a game of 'I never *said* yes."