I stand corrected, but what if you were that person on a space-station, but with a really hot woman with you? Realistically being the last man alive with the last woman alive is the only way I could possibly lose my virginity anyway.
Except you don't stand a chance in hell of making it to a space station.
But ignoring that minor detail, if she is there it means she is smart (since NASA doesn't spend millions and billions to send up playboy models for astronauts). That means she would easily realize that there is no chance in hell of achieving a sustainable population from two people. Despite what the bible might claim, that just won't work. Two generations or so of incest is more than enough to lead to a host of genetic deficiencies and other complications, let alone a hundred generations.
but don't forget that Adam and Eve had perfect DNA, it worked then but it wont any more our DNA has degraded too far. after all how else would we be here if there wasn't someone to start us off??