After dinner and a movie, Carl drove his date to a quiet country
road and made his move. When Mary responded enthusiastically to 
his kissing, he tried sliding his hand up her blouse.
Suddenly she pulled away, got out of the car and stomped home. That night
she wrote in her diary,
"A girl's best friends are her own two legs."

On their next date, Carl returned to the country road. As they were
necking, he slid his hand up Mary's skirt. Once again she pulled away, 
got out of the car and stomped home.
That night she wrote in her diary,
"I repeat, a girl's best friends are her own two legs."

On the third date, the pair returned to the country road. This time Mary
didn't get home until very late. That night she wrote, "Dear diary: 
There comes a time when even the best of friends must part."