The idyllic haven of Elysia did not permit men to step on their shores. The women-only clan forbade it after a male human came and woo'd their Amazonian Queen, only to rob their treasury and abandoned his pregnant lover. These events have had a deep impact on the Elysians and their laws, hence their intolerance of male visitors.
So when one was discovered to have snuck abroad the island several years later, the females were naturally furious. Some demanded that he be beheaded. Others wanted him locked up indefinitely. Until a prominent figure intervened in the matter. The child of the affair that had shamed the Elysians, and their future half-blood queen. Princess Selene Typhaine.
Selene argued that the intruder be given a chance for freedom, believing he ought to be dealt with fairly. At first the idea was met with humility, until she proposed the male's 'test'. A wrestling match, a proud tradition of her home. The man would have to pin her or make her submit, and he would be granted freedom. But if he lost, he would become an Elysian slave to the Amazons. This caused the women to accept the idea eagerly, keen to see the foolish man humiliated and dominated for thinking he could defy their rules. And so the match was set.