A 78 year-old man came into the doctor's office and complained of being tired. The Doctor asked if he'd done anything unusual lately.

The man said, "Well, Wednesday night I picked up a 20 year old secretary, went back to her place, and nailed her 3 times. Thursday, I met a 19 year old waitress at the diner and we went out to Lover's Rock and made love 4 times. Friday, I went out with an 18 year old friend of my granddaughter's and we ended up making it in the back of my Ford. Saturday I was lured into a motel by 17 year old twins..."

The Doctor said, "That's absolutely astonishing. But with all the dangers of sex these days, I hope you took proper precautions..."

"Of course," the old geezer replied, "I gave 'em all phony names..."