A man, a dog and a sheep drift on to a desert island after being involved in a shipwreck.

This island has everything the man wants; fresh water, fruit, etc. But in a couple of week the man starts wanting a shag, so he looks at this dog and thinks to himself "No way". He looks at this sheep and thinks "Ok then." So he walks up to this sheep, takes his pants down, but the dog runs up and starts barking and the sheep runs away.

The next day he's up a tree looking around and sees the sheep but no dog. So man climbs down from the tree, goes up to this sheep, takes his pants down, gets it out. But the dog runs up and starts barking again and the sheep runs away.

So the next day he is up a tree again. Sees another ship wreck and there is this absolutly geogous woman laying on the beach. So he goes out and saves this gorgeus woman and brings her back to his camp.

This woman gets down on her knees and says "oh thank you! To repay you I will do anything you ask of me, anything!"

So the man thinks for a moment and says "Well, you couldn't take this dog for a walk could you? Because I really want to shag this sheep".