Biker Bob and his wife, Bert, had settled in for a long fall night. After a little bit Bob started making moves that made it plain to Bert that his intentions were amorous. "Not tonight, Bob," says Bert. " I have an appointment for a pelvic exam tomorrow and I hate to make love the night before. "Oh, okay," says Bob, and he rolls over to go to sleep. Not more than fifteen minutes later he shakes Bert awake and asks, "Say, Bert, You don't have an appointment with your dentist tomorrow, do you?"