From the China Post:
In ancient times, the sons of almost every family in the region of Upper Dolpa would jointly marry one woman but the practice of polyandry is dying out as the region begins to open up to modern life.
But polyandry prevents the practice of each generation of a family dividing their holdings, and food supplies just manage to cover the locals' basic needs.
Marriages are typically arranged, with a family picking a wife for their oldest son and giving the younger brothers the chance to wed her later.
In some cases the wives will even help raise their future husbands, entering into sexual relationships with them when they are considered mature enough.