Dog?

Apart from worms and some other slimy animals and insects, humans are the only creatures who try to get it off while lying down face to face. From a strictly biological point of view it`s an utterly silly thing to do. Of course, it makes it possible to kiss and look each other in the eyes, for what it`s worth, but on the whole it`s terribly impractical. Bellies, breasts and thighs often prevent a full, deep penetration like you get when banging doggy-style.
Considering that there are very few missionaries these days, but a hell of a lot of worms, the missionary position should actually be called the worm position. On the same note, the doggy-style position could be renamed into piggy-style or badger-style. Or why not natural-style? When all the kissing and eyes-watching is done away with, everyone knows it`s the best way to go.