It looks like a lot of MRAs buy into the most extreme feminist concepts about how rape is defined, either saying that it's rape if the woman doesn't like it, or going further and saying a woman cannot meaningfully consent to sex with a man at all, if she thinks he might be violent.

So this is a discussion of a scene from Game of Thrones season 5, episode 6 [spoilers ahead and probably throughout the comments]

Context is that Sansa Stark has decided to marry one of the Boltons despite them being responsible for killing half her family. She does this deliberately as part of a plot to get revenge on them. She knows that the man she is marrying is a psychopath and chooses this path anyway. Two scenes are dedicated to her establishing that she knows exactly what she is getting herself into, and a third to the wedding itself where she (per usual wedding vows) consents to marriage and therefore sex.

Marriage is void without sex. A commitment to marriage is a commitment to have sex (this is why a marriage with no sex is void and can be annulled, even today), and that's especially true in the sort of medieval-ish setting of the story. As per custom therefore the next scene is Sansa and her nasty brutish husband heading upstairs to have sex. This is not a surprise to anyone.

In the bridal bedroom her husband predictably acts like a huge jerk while she starts taking off her clothes. He then rips off the rest of her clothes and (out of camera shot) presumably roughly enters her.

And apparently everyone in the world now has to pretend this is rape even though it's hard to see how she could have more obviously consented if she'd signed a contract in blood. In asking people why they think it's rape even when she consented, the two answers I get are the following:

(1) She didn't like it so it's rape. By this argument every act of sex by a prostitute is rape I guess.

(2) her husband didn't threaten her but could be considered to have implicitly threatened her merely by being the sort of person that might have threatened her or might have forced her. So it counts as if he did threaten her, even though he didn't actually make any threat.