Adam and Eve being sinless is literally a perfect human. Biting the apple gave them that animalistic desire system, hence why they got embarrassed that they where naked and so on. Embarrassments, especially over being naked, come from the fact that sex and intimacy are morally very personal concepts, and so being naked and exposing yourself carelessly to the public breaks that conceptual understanding, and you feel really bad because of it. Others find you weird, perverted, they dont want to interact with you. But this is a primal good/bad response. If you allready understand that sex and intimacy are a personal thing on the rational level, you don't need clothing because clothing is to stop your animal brain from throwing alarm bells.

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