As tends to happen at the start of jokes, 5 men and a woman survive a shipwreck, and wake up on a deserted island...

...where they find everything they need to survive and live well: food, water, shelter. But being people, they have certain needs. Lovey-dovey needs.

The woman is a proper lady, though, and so they come up with a fair system. She will sleep with the first guy the first week (unlimited supply of condoms too on this heckuva-awesome island), guy #2 week 2, guy #3 week 3, guy #4 week 4, guy #5 week 5, and then start back over with guy #1 for week 6.

They all agree, and for ten straight years, they live like royalty.

But all good things must come to an end, and sadly, the girl eventually passes away.

The first week after things are fine.

Week two, things are starting to deteriorate.

It's messy by week three.

By week four, it's unpleasant by any measure.

And week 5, by week five, it's simply unbearable.

So they bury the body.