Here's a selection of 50 such movie sex scenes, from the classics to recent releases, each one seemingly crazier than the next.
More crucially, the scene is dramatically motivated: a primal exchange of power and vulnerability.
Why is it so groundbreaking? Follow-up question: Remember The Change-Up? Disturbingly, Stone was never told how, er, revealing, the scene was, but she says she supports the choice to keep it in the movie.