re: You're the last man on the planet and you're needed to repopulate the species..

quote:

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All your kids would be screwing each other so your grandkids would be idiots so we'd be screwed anyway

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Not necessarily. I could focus on women born before 1995. In 16 years or so (2031) my sons could take care of women born between 1995 and 2010. In 2047 my grandsons could start on women born between 2010 and 2017. You don't see a closed DNA pool until you get to women born after 2017. By then, you've put in enough separation.