My very favorite position I just stumbled onto with a girlfriend almost 20 years ago, and I've been using it ever since. The woman lays either on the edge of the bed or on a chair/sofa with her ass hanging off. I kneel in front of her and wedge the head of my cock inside. I slip my arms below her thighs and grab her arms, and then eventually move to where I am fully inserted. You go really deep, and not every woman can handle it, so you have to be careful working it in. Hip movements by either of us are really intensified, and when I'm in all the way not only am I pressing up against her clit, the angle often has my cock making her belly bulge from where it's poking--something not only hot from my perspective, but from almost all of my partners' as well.