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“They realized the concentration and density of hair was so high that it was invented instead for women’s legs,” said Mr. Fowler, the Nair researcher. The product was introduced in 1940. Ellen Frankel, a clinician who has done studies of Nair products on paid subjects for 25 years, said that once men have tuft-free shoulders and backs, they tend to want to stay that way. “We’ve done some studies where we’ve removed the hair on men’s knuckles, and some of the men like it so much they keep doing it,” Ms. Frankel said. “I wax my husband’s knuckles every time I give him a manicure, and have for about five years.”
