I had noticed this also.
My sovereign was understandably upset; and began by sending out any heroes of the appropriate gender to meet him in the field.. For some reason.. None of them made it back home. Regretable, really.
But then it kept happening! Unbelievable! With a Civilian! A Pleb!
Suddenly a policy of mandatory drafting of all ages was implemented, and they were stationed at remote outposts and other cities further afield.
Nor did this stop this seemingly mystical production of offspring. It was at this point, I think, where my Sovereign simply decided he no longer wished to know with what or whom these babies were being made with.
Harrumph.