Happens to me because the nun won’t loosen her grip and the jello in the tub is cold. The guy with the camera hates it because he can never focus properly when it happens.
Seems a tad cold & informal to shake hands during.A tender kiss on the cheek normally expresses satisfaction for rumpy pumpy’s, in my experience anyhoo.
Lucille is partly correct here in that it’s part of the evolutionary process…and all that is left of the Happy Farmer Dance that early cavemen used to do when they orgasmed. ;)