This technique is particularly effective if the receiver is also performing oral sex on the giver(s). As he's on the way to orgasm, start letting some spittle slop around between your mouth and his cock. Try to get a long hanger between the two. Once he ejaculates, let the spittle and sperm mix in your mouth and drool it down your chin and all over your body. You won't believe how far a sperm laced spittle glob will stretch.