Two men and a woman on a marooned on a desert island
 

So there's two men and a woman, marooned on a desert island. They have plenty of food and water, but they're stuck there. Eventually, they start to have certain desires, and it basically turns into a mini-orgy. This is all going along fine until the woman starts to get depressed, she's so depressed at being stuck on the island that she kills herself.

So there's just the two men left, and they still have plenty of food and water, but certain urges take control, and they find ways of relieving them, so to speak. This is all going along fine until one of the men says to the other "I don't like this, I don't think it's right". The other man says "Yeah, we really should bury her".