The main variation of this position requires the man to be on top and position his head slightly above the womans head (chin to forehead). The man should then grab the end of the bed with his hands if possible and proceed to quickly pound the vagina.
now becoming a rare site due to the widespread use of low-floor, easy access buses. but can still be witnessed on the odd bus route operated with step-entrance buses, or coaches. national express seem to get a lot of this particular type of passenger.
generally these people will be the first to get up, and will be waiting by the door as the bus arrives at their stop. they will then proceed to turn around and move extremely slowly, whilst other exasperated passengers stand patiently waiting, wondering why he/she couldn't have just waited for everyone else to get off first.
"we've had a complaint. you apparently didnt stop to pick up Mrs. xxxxx this morning"
"thats because she's a deep-sea diver, and i was running late"