Man lies down, lady on top but sitting quite forward with knees quite apart so lots of control. Lady leans forward over man, hingeing from the hips so that both torsos, penis and vagina are all parallel and clitoris is touching man. Man keeps his knees up like a buffer, lady does forward and back movements rather than any bounciness. Lady does all the work but don't let that put you off - it's very quick and efficient!
Try it! Then come up with a name for it, if it doesn't already have one .
Obviously not for those with big bumps.