[Mr. Blonde]

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"He's an alien, for Christ sake. His Kyrptonian biological makeup is enhanced by earth's yellow sun. If Lois gets a tan the kid could kick right through her stomach. Only someone like Wonder Woman has a strong enough uterus to carry his kid. The only way he could bang regular chicks is with a kryptonite condom. That would kill him. "

[Fixit]

You've both probably seen this before, but for posterity's sake:

Man of Steel, Woman of Kleenex by Larry Niven (1971)