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Skin:

3. The skin releases as much as three gallons of sweat a day in hot weather. The areas that don't sweat are the nail bed, the margins of the lips, the tip of the penis, and the eardrums.

4. Ooh, that smell: Body odor comes from a second kind of sweat — a fatty secretion produced by the apocrine sweat glands, found mostly around the armpits, genitals, and anus.

5. Yum! The odor is caused by bacteria on the skin eating and digesting those fatty compounds.

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