Or is it the science of face fucking? To be true, it is all about anatomy, and one's ability to relax the throat as it accepts a thrusting cock. Though whether that comes down to cold, hard scientific method or a more nebulous, artistic talent? The jury's still out on that one (we'll have to get Bobbi Starr to weigh in on it herself.)
[Via Reddit. Have a gif you'd like to see us feature? Email us!]