Sorry if you've already heard it. Deirdre, Dave and Derek are shipwrecked together on a desert island. After they have got the essentials like water, food (coconuts) and shelter sorted, their sexual urges start to assert themselves. They do what comes naturally and the two boys took turns with Deidre. This arrangement worked satisfactorily for a few months, but then Deidre started to feel guilty: so guilty in fact, that she topped herself! Naturally Dave and Derek were initially very shocked and went through a period of grief, loss and celibacy for a few months........until their sexual urges began to assert themselves..... again. They then proceeded to do what came naturally. However, after a few months of carrying on like this, they began to feel very guilty and in the end, and decided to put a stop to it.