I picked this up when it was on sale recently, and my impression was that it could have been a post-apocalyptic Earth. I didn't think that it was unreasonable for Jerin to be muscular, since he was allowed to work out and train with his sisters. Since higher testosterone levels are related to muscle building, unless whatever caused the rarity of men also affected testosterone levels, I would think that a male who was doing heavy lifting and other sorts of manual activities would still develop muscles.
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