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… and makes male diners tip more

Male diners give bigger and more frequent tips to waitresses wearing red T-shirts than to those wearing black, white, blue, green, or yellow, according to Nicolas Guéguen and Céline Jacob of the Université de Bretagne-Sud in France. There’s no such effect from female customers, however, a finding that aligns with research suggesting that red increases women’s attractiveness to men. The study was conducted in France, where tips are generally included in the bill and additional tipping is considered optional. 40.7% of male diners in the study provided additional tips to waitresses, compared with 33.1% of females.