Now, think about the last time you saw a white guy get it on with a black lady (and again, where race wasn't a major theme of the movie). The list is surprisingly long: The Bodyguard, Die Another Day, The Score, Boiler Room, Mission Impossible II, Austin Powers in Goldmember, Avatar (kinda), The Princess and the Frog, Star Trek the movie, Star Trek the TV show and just about every movie Halle Berry's ever been in.
She's got that vanilla fever.
So What's the Deal?
It's not just our imagination. The "Audiences Don't Want to See Black Men Taking Our White Women" thing is so ingrained that Will Smith claims that Cameron Diaz lost the lead role opposite him in the movie Hitch because producers were worried about "the nation's problem of seeing a black man and a white woman getting intimate." So, Cuban-American Eva Mendes was cast instead. Hollywood has apparently decided that Mendes is a nice compromise to the black man/white woman problem -- she gets those roles again and again and again.
This one goes allll the way back to 1915's Birth of a Nation. Today, it's a punchline about how racist everyone used to be, but it was the first movie shown in the White House screening room to then President Woodrow Wilson. Up until the 1960s, it was widely regarded as the greatest American movie. And the second half of the movie is essentially a slasher flick in which "renegade slaves" (white guys in black face) play the role of Jason Voorhees, and pretty white girls play the role of ... well, the pretty white girls in slasher movies. It even has the standard "TURN AROUND HE'S RIGHT BEHIND YOU!" slasher movie shot as she's stalked by the monster ...