The reason why fit people grow Man-Boobs is because the water filters that filter sewage water into drinking water don't filter out Estrogen, the female version of Testosterone, which is flushed down the toilet by women when they pee or have a period (from tampons). This has also caused the fish in various areas of water to completely switch genders. (ie going to sleep with a cock and waking up to find you have a fanny)

Why did I tell you this?

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No reason :3