Ejaculation of semen is entirly involuntary in the human male, and in all other forms of terrestrial life. It would be unreasonable to assume otherwise for a kryptonian. But with kryptonian muscles behind it, Kal-El’s semen would emerge with the muzzle velocity of a machine-gun bullet(3).
Artifical insemination may give us better results.
(3)One can imagine that the Kent home in Smallville was riddled with holes during Superboy’s puberty. And why did Lana Lang never notice that?
Is this a Man of steel, woman of Kleenex scenario?
Or this:
What a wild ride.
If you like scifi, I recommend his books and short stories.
Always looking for new books to read, thanks friendo!