You're lying on your back, he's on top. Hook your legs up and over his shoulders for deeper penetration and to give him complete control.  I think that this a great position for maximum deep penetration. Oh, if you cross your ankles behind his head, it helps to tighten the vaginal canal. It is also a great way to squeeze him in and make him feel fuller inside you. The scrotum brushes against your buttocks with each stroke. You can reach forward to stroke or cup his testicles, while he can do wonderful things to your breasts with his hands.  Sound good? Good.

Next up the Slide...