Why is it Called the Missionary Position?

This was a topic during one of our member shows recently, and I promised I’d get to the bottom of it. After reading several sites, they all seem to have the same story behind the Missionary Position.

Early European Missionaries found out that the natives were having sex in strange positions. Those positions are most likely what we call Kama-Sutra today. Sex was only to be used as a way of propagating, and the Missionaries thought that there was only one right way to go about doing this in the eye of the lord. It must be done face to face.