Credit: Thos Robinson/Getty

According to Ryan Gosling, Michelle Williams is an all-star in the bedroom -- on screen, that is.

"I felt like Scottie Pippin and she was Michael Jordan," the 30-year-old actor told at the Quintessentially and Stoli-hosted Blue Valentine premiere in NYC Tuesday. "Every time I gave her the ball, she just flew through the air and she slam-dunked it."

In the seductive drama (in theaters December 31), the costars engage in some pretty racy sex scenes -- so racy, in fact, that the MPAA originally gave it an NC-17 rating.

(Deadline reports that the MPAA overturned the rating after Hollywood heavyweight Harvey Weinstein made a personal appeal; Blue Valentine now has an R-rating.)

"People don't understand what NC-17 means. It's not like we're saying we think kids under 17 should see the movie," Gosling explained. "What NC-17 really means is that it can't play in regular theaters and you can't even show an ad for it on television. I don't think it deserves that."

Despite the film's harsh rating, Williams (who denied dating her costar earlier this year) has only fond memories of her time on set -- as does Gosling, who remembers their sex scenes as "all a blur."

"The thought that this thing that I had spent seven years of my life on was down in its final stages was too much for me to bear," Williams, 30, told Us. "I wasn't ready to let it go."