'I'll marry your sister if you marry mine. And if you divorce my sister, I'll divorce yours.' That is Yemen's 'Shegar', or swap marriage, an agreement between two men to marry each other's sisters, thereby removing the need for expensive dowry payments. But the agreement also states that if one marriage fails, the other couple must separate, too, even if they are happy.
BBC Arabic's Mai Noman returns to her native Yemen and hears the stories of two women who have loved and lost because of Shegar.
Nadia lives in the village of Sawan on the outskirts of the capital Sana'a with her family. She was married off at the age of twenty two and has three children. But because of her family's decision to marry her in the Shegar tradition she was forced to divorce when the other couple's marriage failed. Now she and her mother have to live with the stigma attached to divorce, and she only has limited access to her children, who remain with her ex-husband's family.
Nora and her brother Waleed had little say in marrying their cousins through Shegar. But when one marriage failed, hard choices had to be made by everyone. Mai asks why an old tradition that forces you to love only to force you to part, is still practised in Yemen.

Producer: Arlene Gregorius.