Not intimidating, just mean to her.

Her boyfriend was not an intimidating person, but the professor was.

Exactly, she was definitely nervous about doing it with the professor, but not her boyfriend.

The only thing he forced her to do was say what she said.

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one thing i want to know is did he beep her in the ass or in the vag?

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yep, that's what i was thinking about the scene. just one big Fetish.
Warner Music Group Sucks!

Uh, I like to be called a dirty boy and stuff. Some people like to be called dirty, nasty, an idiot, a piece of beep etc. That's sex.

pretentious: characterized by assumption of dignity or importance.

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Dirty talk does it for some people! She is using very taboo terms, and often, the thrill of doing something that is 'frowned upon' makes the situation more intense. It's no different than some people getting turned on by having sex in public You're pushing the envelope in both cases, just in different ways.
It kinda flips our perception of slavery as well, doesn't it? Another detail that adds to the shock.
Do you like having sex? Then DON'T buy a Nintendo!

you're not black
i've got feelings too, ya know - inbetweeners
http://melanoidnation.org/white-man-warns-all-black

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Exactly, we only see him shirtless.

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And she let her boyfriend finish. We don’t see the whole encounter with the professor.

It’s been years since I’ve seen this movie, but I think Selma Blair’s character was also used to seeing her boyfriend nude, since, according to him, they had sex before.

And the professor wasn’t fully naked in front of Vi, but Marcus was.

Plus, she did it with Marcus in a different way than the professor.

exactlyjebus pretty much hit it dead onit was confronting the true mental aspect behind all of vi's relationshipsshe even starts yelling it louder and louder as they go onthey discuss the reasons directly in class after she tells her story

Well, with the handicapped boyfriend, she always had the power.
And she was trying to show how liberal and open-minded she is, by first dating her boyfriend, and then, screwing the professor.
In the bathroom before she had sex with professor, she kept repeating to herself, "Don't be a racist!" because she was scared and confronting her own stereotypes of black people, or black men. And the professor knew that that was the reason why she was having sex with him. So he told her to say those things, because subconsciously, that's what she wanted to say. She enjoyed it. But then felt guilty about it - as evidenced by the "You're all sweaty" comment by her boyfriend.
However, in that act, she felt the power was taken from her when the professor knew the reason why she was with him and forced her to say it outloud, unlike her boyfriend. So she "told a story," and changed it all around to make her seem like the victim and that she was raped.

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You guys that keep bringing up rape are missing the entire point.
She is dating the handicapped dude for the same reason she screwed the professor.

I would agree with hooper on this. Mr. Scott was completely aware that Vi, as well as many if not all the co-eds, were giving it to him even though they were trying to break through their own racial barriers.
I most definitely would NOT refer to it as rape, and the pictures were probably intentionally left in the bathroom for all of his "guests" to see prior to their humiliation.

1. Vi never said NO.
2. Nothing in the scene suggested that Vi lost any control or power to leave at any time. If the "victims" felt that there was any rape involved, then it was a form of self-rape.