Brians, Paul. Nuclear Holocausts: Atomic War in Fiction, 1895-1984.
"An important subcategory of the post-holocaust love story is the Adam and Eve formula, in which the two survivors of a holocaust must mate to ensure the continuation of the human race. The genre is a large one, including many stories not depicting a nuclear war, and was well established long before the atomic era. One of the best known early examples is Alfred Noyes's 1940 novel No Other Man, mercilessly satirized in Ronald Duncan's 1952 atomic test catastrophe novel The Last Adam (London: Dobson). Satiric treatment of the formula also figures in Damon Knight's "Not With a Bang" (1950; note the punning title), which is little more than a joke criticizing female prudishness. At the end of the story the last man stands paralyzed and dying in a men's room while the last woman waits outside, too proper to enter and see what is taking him so long."
The Last MAN on Earth
"Another way in which atomic warfare is connected with sexuality is in its effect on reproduction. In The Man with Only One Head (1955), Densil Barr depicts universal sterilization from cobalt-bomb-induced radiation as creating a frenzy of illicit copulation (one would suppose no contraception was available in 1955); adultery is consequently made a capital crime, despite the fact that 43 percent of the married population is indulging. Barr satirizes the values of his time by stating that men would rather see the human race die out than have their wives impregnated by the one man left fertile on Earth."