My favorite bit:
We have not yet considered the existence of a Supergirl.*
*She can't mate with Superman because she's his first cousin. And only a cad would suggest differently.
The various incarnations of Supergirl:
Totally logical within the premise of the Superman mythos. My favorite thought experiment is what happens when post-pubescent Clark Kent 'whacks off'? Even in farm country Kansas, super sperm will find ...