Come on boys, vogue! The youngest generation’s greater willingness to embrace nontraditional gender norms has opened up a new market within the beauty industry: men’s makeup. One-third of young men said they would consider wearing makeup, according to Morning Consult polling, while 23 percent of all men said the same. Founders of men’s cosmetic brands credit the increased interest among young men not only to a wider acceptance of the idea that gender is fluid but also to the pressure to be picture perfect at any moment, thanks to social media. “The stigma associated with buying and purchasing this product...