And I think mankind had learned the "missionary" position before then.
Which reminds me of an old joke.
A missionary on a South Sea island is trying to teach English to his star pupil. As they walk around the missionary points to an object and speaks it's English name.
"Rock," says the missionary....pointing at a rock.
"Rock," says the student, pointing back.
"Tree," says the missionary....pointing at a tree.
"Tree." says the student....pointing back.
"Hut," says the missionary....pointing at a nearby hut.
"Hut," repeats the student....pointing at the hut.
As they walk by the hut, however, theystumble across two people making love.
Flustered and embarassed the missionary points and says "uhhhh....riding a bike."
The student picks up a big rock and bashes both of them in the head.
"What are you doing?" shrieks the missionary!
The student answers...."Him riding MY bike."