A guy and his wife are lying in bed when the husband starts caressing her back.

“Not tonight, dear,” she says. “I have an appointment with the gynecologist tomorrow.” The husband rolls over and tries to go to sleep. A few minutes later, he turns back and again starts caressing her back.

“Honey, stop,” she says. “I told you I have to go to the gynecologist in the morning.”

“I know," he answers. “But you don’t have to go to the dentist, do you?”