By Amazonian Law

Summary: the Amazonian law states that women who are defeated by outsider women are to fight to the death to regain honor. However, those who are defeated by outsider men must marry those men.
In a tribe whom is prideful of producing powerful warriors, such rules would apply for a male defeated in battle. An outsider woman capable of defeating him is worthy of being his bride.
In short; Mousse is bested by the reader, forcing the traditional laws to apply, but she is reluctant, despite the likeness she has for him, and the little aching feeling in her chest, he morality fights against this proposition...
And then there's the issue of Shampoo...