Put a ring on it
Circles try and avoid flights of servant concubines to come over and have your children. The most efficient way is to have children to a local girl of walking distance and save up for a ring, Diamond for a virgin, emerald for a servant girl or amethyst for a concubine. I see three single ladies; a virgin, a servant or concubine. But if the local girls reject your dna then you will have to bring servant concubines from across the boarder.