A g-string is a narrow piece of cloth or leather that passes between the legs and buttocks and is attached to a band around the hips, worn as a bikini bottom or as underwear. The backside consists only of a string band.

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  Man wearing a red G-string
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  Woman wearing a pink G-string
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  Man wearing a red G-string (left image). Woman wearing a pink G-string (right image)
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  Woman wearing a white G-string pole dancing
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  A woman wearing a white g-string bikini and bra
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  G - String
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  Bodypainted and red string
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  Strings in a window to dry
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  A woman wearing a g-string - backside
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  A young woman wearing a string and showing it to me
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  Black G-String Bathing Suit
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  A woman wearing a g-string - frontside
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  A woman wearing a g-string - backside

See also: Fundoshi.