An actor's sock
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The sock a male equivalent to the G-string.
“It’s a flesh-colored pouch that wraps your genitals up like a bag of leprechaun’s gold,” describes [Queer as folk’ Hal] Sparks. “It’s got a drawstring—so, even sexier—you’re doing this whole thing with a tourniquet on your penis.”
More about the simulating and business of sexuality by actors: Fakin’ It