Edge of a bed, so I can put my feet on the ground, while the girl can still essentially stay in the cowgirl position. First, we start with my back on the bed and she rides me as if we were fully on the bed. Then, when we feel like picking up the pace, I fully sit up, grab a good hold of her by wrapping my arms completely around her waist or back, and basically start lifting her up and slamming her down on my dick. The bed has to be just the right height for the guy, and it better be sturdy. Oh, and you have to be careful how high you lift the girl up, before going back down because if your dick happens to come out of her and she instinctively pushes down, you will find yourself in a world of pain.