Deserted Island Scenario

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I want to warn you ahead of time that some might find this a little offensive. However, though normal people will be disturbed by the prospect, there is nothing in this post that is descriptively vulger. You have been deserted on an island with a sybling of the opposite gender (fully capable of reproduction) without any chance of ever leaving. However, there are plenty of fish (high in Omega3 greatly decreasing or eliminating birth defects), bananas, and coconuts to sustain you for a lifetime. The both of you have one dilemma, since you both know you will never escape, you will never have a life of your own off the island again. You both must agree to decide whether you (a) die virgins (primary/secondary), or (b) start your own colony; what would you do?