There is this ship that goes out to sea and crashes. 6 (1 woman and 5 men) people survive and use a safety raft to float to a deserted island.
After spending several weeks on the island, they all begin to get really lonely, and sexually deprived. So they come to this agreement: each man will marry the one woman for a week. So the first man has her for one week, then the second man has her for the second week, and so on.
Everyone will now be getting sex and they all agree to it. This goes on for five years and everyone is happy. Each man gets sex every fifth week and the woman gets to have sex whenever she wants with a different man every week.
Well, a few weeks into the fifth year, the woman dies!!!! The first Week is pretty bad, the second week is is still pretty bad, the third week it's getting worse, the fourth week things are just bad, really bad, the fifth week it is just awful, it's getting so bad, soooooo...on the sixth week......
...they bury her.