What does that even mean? They understood the sex was to be consensual without the actual woman's consent? This is her defense???
Umm. The rape fantasy is quite common. Somewhat less common but not at all unusual is role-playing arranged in advance to ignore all protests, usually unless a specific safeword is used.
Such things DO happen. There was a recent case where a woman arranged it all in advance over the web, and then claimed she had in fact been raped to get sympathy.
A pretty bad thing to arrange for another woman without her knowledge, and a pretty dirty trick to pull on the man in question, too. Though I have a good deal less sympathy for him.