Its called the 'Horny Fishmonger' it was invented in the late 16th century England that allowed wives of fishmongers to pleasure their husbands whilst still being able to wash the kitchen floor. It also allowed the wife to bury their head into the pillow of the bed or whatever piece of aparatus they were doing it on because as the male had been handleing fish all day, he came home smelling of rotting fish, which as you may know can be rather pungent.
This position also allowed easier access for the male to enter the female because being in the fishing industries and obviously being underclassed the male obviously has a rather large stomach which during normal intercourse could an does interfere with the mating process. This is caused by years of a bad diet from cheap foods.
All information was sourced through Wikipedia.