It's a nice fit between them and worth taking a moment or two to appreciate. Since humans vary so much in shape and size, there's no guarantee that meeting someone you find attractive is going to compliment you physically.

He kisses the hell out of her and then, lays back to let Carol set the pace. When he has a read on how fast she's gonna go, he'll move fractionally with her. It doesn't take much of an arching of his hips to hit new depths.