It is near future, and our planet is proliferating with humanity. You are a 28 year old man fleeing the roving bands of cannibals. Your only refuge is an uninhabited tropical island copiously supplied by coconuts and circled by schools of fish. Your only remaining concern is to satisfy your raging heterosexual libido in a politically correct fashion. Alas, you have no condoms, and your scruples debar you from orthogenital intercourse on pain of aggravating the global catastrophe. You must choose an unfailingly stimulating companion for the rest of your life. Unfortunately, your choices are limited.