The period of great sadness that occurs between the time a man ejaculates and when a man can become erect again. Also known as "The Great Depression"
After ejacualating into Susan's face, Billy experienced a refractory period
A period of great sadness. Specifically, the time after male ejaculation during which he is not able to maintain another erection.
Ellen is so hot, I don't even experience a refractory period after I bang her, I can go straight through all night.