Sooooo humiliating. I think this has got to be one of THE most humiliating things that can happen to a man, a husband. To get so excited just from watching his wife with another man that he can't control his own ejaculation? Oh god
He's a lucky cucky! If you're not an alpha having sex with a beautiful woman, the next best thing if you're a loser beta is to witness a real man impregnating one. I think it's as ancient and primal an urge as sex itself.