Dad came home one day in an exceptionally horny mood and took his wife upstairs to exercise his marital rights. Just when they were really getting into it, their 5 year old son entered the room and started to cry.

"What's wrong, son?" the father asked. "Why are you crying?"

"You're hurting my mommy," the little boy replied.

"No, no," the father reassured. "I'm not hurting her. We are making babies."

This seemed to calm the boy, and when he left the room, the couple went back to their business.

The next day the father came home from work early and found his son on the steps, crying.

"What's the matter NOW?" asked Dad.

"It's those babies you were making with mommy yesterday," the boy answered.
"The mailman is upstairs eating them."