Ethan Of Athos by Lois McMaster Bujold

In a universe where the planet Athos is populated solely by men, a dedicated reproductive specialist embarks on a mission to procure new ovarian cultures essential for the colony's survival. His journey takes him beyond the sheltered confines of his home world to the bustling and diverse space station Kline Station. There, he finds himself entangled in a web of intrigue involving espionage, unexpected alliances, and the complexities of interstellar politics. As he navigates this unfamiliar terrain, he must confront his own prejudices and adapt to a broader understanding of humanity, all while striving to secure the future of his people.

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