Put Your Hand Under My Thigh, Is That Like a Pinky Promise?

The hand under the thigh business, is that like a tatlika pinky promise? Hah ha, ha. What is this? It sure seems that waya the thigh. And the ancient cultures, was very often an idiom for the groin and the organs located near it. So when he says, put your hand under my thigh, he's essentially asking him to make a covenant in a very eastern way. Nothing sexual about it, in regard to we would react to that, but definitely an interesting figure of speech in hebrew idiom that adds a little color to the story.