From today's ci-en post (google translate):
"We have been very silent. In the next version, a short stack and a player character will be added. Player characters will be applied preferentially in adult format, and player characters can have sex with existing female characters. Monms can only have sex with player characters." No updated demo download with this one.
So they plan to allow the player character to use any female units. I'm guessing that we'll be able to breed more humans this way? I wonder how this will affect game balance. I really can't wait for the next patch...