Living male: my ex-roommate Duke. Spent two years in a college dorm room with a succession of other roommates constantly in and out for various reasons, so we can get along. Plus, at that point there is a good chance I wouldn't be worried about the effects of drugs/alcohol to avoid them, and he ALWAYS has connections
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Dead male: The man who was the inspiration for "Robinson Cruiso". I don't remember his name, but he actually spent years on a deserted island before rescue.
Living woman: Another vote for Natalie Portman. If I have to spred my genes, might as well be with someone who's drop-dead gorgeous
Dead woman: Audrey Hepburn. See above for reasoning.