Who says they will have any?
There is birth control.
You sure can’t mandate sterilization, and considering how many people who can manage to live on their own can’t manage the faithful use of birth control, I think you might be expecting a bit much in this circumstance.
And we see many times over that ppl (evidently of higher intelligence) who are required to take their medication on a regular basis, do so religiously...right! What could possibly go wrong?