Ah so desu ka. That plan for utopia.
When you invade a city, kill everyone except the girls.
Then -
Check them for virginity, kill them if they don't
pass inspection.
No. Not utopian. But the next stage in our social evolution judging by history.
Family, tribe, state, city-state, nation - next is world civilisation. World communications and scientific progress has made it not only possible but inevitable.