Every night while Dave is having dinner with his wife, Natalie goes to the bedroom, turns off the light and makes out with Dave’s friend Andy by the window.
After some days Dave had doubts and leaving supper he went to the dark room only to hear whispers from the other side of the window.
He pushes Natalie away, goes near the window,unties his pants and puts his arse facing the window.
After a minute Andy puts a kiss on his butt cheek and says “Natalie, haven’t you brushed your teeth today?”
This joke is included in the Black Book of Jokes. You can order it from here.