A gaff is a piece of fabric, usually augmented by an elastic such as a rubber band, that is designed to hide male genitalia. It is usually worn by men with body dysmorphia, trans women or male cross-dressers. Since the 2010s, underwear manufacturers have begun to design underwear with the same function as gaffs. Home-made gaffs are usually made by cutting the ends off a single sock, and then placing a pair of elastic loops through them. The main function of gaffs or underwear that replicates gaffs is to make the male groin appear smoother and flatter in order hide the male crotch bulge, also sometimes referred to by the slang terms moose-knuckle or man-bulge.
In 2019, an adult entertainment company developed a boxer short brand that is designed with an inner lining that prevents erections from protruding through clothes, thus concealing public erections.
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