A plane crashes on am distant island and there are only three lucky survivors: The co-pilot, a stewardess and a passenger. Unfortunately, this island is far away from any ship route, meaning that they are stranded there, possibly forever.
So, they started to build shelter, learn how to fish and hunt and how to spot and collect various edible fruits and vegetables. They even managed to keep track of the days on a huge calendar they carved into a huge boulder.
Week after week they work on their new home and soon the former shelter became a nice house. They distributed the work evenly and according to their individual skills and soon their survival was simple. They started to see this Island as their new home and the three survivors formed a strong bond over the months they were stuck on the island.
But something was missing. Not the internet, not alcohol or other modern commodities. Something more basic.
So, one day the stewardess went to the two men and told them "Listen, guys. We're all stuck here together and I know that you guys are missing the same thing as I do. So, what about an arrangement: one of you gets to sleep with me on the days with an even number and the other one on days with an uneven number. And on holidays we do a three-way. "Both men immediately agreed and so they experienced some wonderful and happy months.
But one day the stewardess got stung by a venomous animal and soon died. Both men were extremely sad and grieved not only over the loss of their sexual partner but because they loved her for being a cheerful, enthusiastic companion.
One evening the former co-pilot went to his friend and said: "I know this loss is terrible, and we surely will need some time to process this, but I think, we should keep the schedule up: you go on days with an even number, and I take the uneven days on the calendar. This will help us to keep our spirits up!" "If you think so..." replied his friend.
And so, they kept on for some months until one day the passenger said to his companion: "Listen... I can't do this anymore. What we are doing is disgusting, unethical and against the nature. We should stop this!"
"Yeah... I guess you're right" said the co-pilot. Let's bury her".