I suppose it even happened to cavemen. You come home from a hard day of hunting dinosaurs with a club and find your woman in the back of the cave getting boinked by another caveman. Of course, being a sensitive, considerate caveman with a tiny dick, what else can you do except sit out in front of the cave and let them finish. It wasn't the first time a girlfriend had cheated on me. But I didn't think Mary would. And not i...