Yes, it was amusing, but he's applying real-world physics to one part of Superman's life, so attempting to apply it to the comics, which work on completely unreal comic book physics is a non-starter.
(In fact, between 1976 and 1988, it was canon that Lois and Clark had at least one natural born kid, as Laurel Kent, until she was revealed as a Manhunter android in Millenium, was a descendant of Superman, via Lois, who she looked exactly like.)