I think it's deeper than that. It's not just the soldiers who feel the urge to procreate at the end of wars. And it has been quite common during wars for soldie

I think it's deeper than that. It's not just the soldiers who feel the urge to procreate at the end of wars. And it has been quite common during wars for soldiers to have readily-available sex (that the term 'camp follower' exists would seem to illustrate this point.) But it seems to be a natural human tendency to want to create new life in response to the threat to existing life. I always liked the line from Rent, "The opposite of war isn't peace, it's creation" because it captures that peace is the neutral territory between the destruction of war and the creation of trying to fix what was broken. When the pendulum swings towards war, its return path will swing past peace and towards reconstruction, in all its forms.