Husband always insisted on making love in the dark.
After 20 years wife turns on the light, finds him holding a vibrator.
She goes ballistic, “You impotent bastard! How could you lie to me all these years?”
Husband looks her straight in the eyes & calmly says, “I’ll explain the toy, you explain the kids…. “
This joke is included in the Black Book of Jokes. You can order it from here.