Bumper Cars is the Rear Entry position with the giver on top but facing the receiver's feet. Getting into the position is a little trickier than usual. The receiver lies face-down on the bed and has the giver lay on top of them. As the position will put the penis at an unusual angle from the giver's body (i.e. pointing downwards) care should be taken to not strain the penis further than it is comfortably capable of flexing!