She's beautiful. And he is actually huge, both thick and long (i'd guess at least 8"). I think a lot of it is just the way they're positioned with her leaning so far forward, their bodies relative to one another and the angle of penetration. while their sex is active and passionate, for most of this action she's not getting anywhere near his balls -- there's 2-3 inches of dick still available to her. She really doesn't take all of him until the wonderful last minute, and I believe she gets off when she does.