A man walked into the drug store and shyly asked the pretty girl behind the counter if he could buy some condoms. She noticed his discomfort, and decided to have some fun. "What size do you need?" she asked. "I'm not really sure," said the shy man. The girl explained that condoms come in three sizes. "There are three holes in the fence out back which we use for determining your true size. Go out back and give it a try."
So, the man went out back and put his 'tool' into the first hole in the fence. The young girl was on the other side of the fence, and she proceeded to give him a handjob.
Then, when he put his 'tool' into the second hole, she gave him a blowjob.
Finally, when he put his 'tool' into the third hole, she turned around, removed her panties, and he entered her from behind.
When he was finished, the girl appeared from the other side of the fence and asked, "So, what size do you need?" "I've decided not to buy any condoms, but I'll take eight feet of that fence!"