Lois could never have Superman’s baby. Do you think her Fallopian tubes could handle his sperm? I guarantee he blows a load like a shotgun right through her back. What about her womb? Do you think it’s strong enough to carry his child?
The second she gets a suntan the kid’ll kick right through her stomach. The only person with a uterus strong enough to carry his child is wonder woman. That or he wears a kryptonite condom, which could kill him…
That would solve the cat problem