"Millennials don’t like to get naked"

From an article in The Atlantic about the decline in sex among young Americans:

“Millennials don’t like to get naked—if you go to the gym now, everyone under 30 will put their underwear on under the towel, which is a massive cultural shift,” Jonah Disend, the founder of the branding consultancy Redscout, told Bloomberg last year. He said that designs for master-bedroom suites were evolving for much the same reason: “They want their own changing rooms and bathrooms, even in a couple.” The article concluded that however “digitally nonchalant” Millennials might seem—an allusion, maybe, to sexting—“they’re prudish in person.” Fitness facilities across the country are said to be renovating locker rooms in response to the demands of younger clients. “Old-timers, guys that are 60-plus, have no problem with a gang shower,” one gym designer told The New York Times, adding that Millennials require privacy. 

Some observers have suggested that a new discomfort with nudity might stem from the fact that, by the mid-1990s, most high schools had stopped requiring students to shower after gym class. Which makes sense—the less time you spend naked, the less comfortable you are being naked. But people may also be newly worried about what they look like naked. A large and growing body of research reports that for both men and women, social-media use is correlated with body dissatisfaction. And a major Dutch study found that among men, frequency of pornography viewing was associated with concern about penis size. I heard much the same from quite a few men (“too hairy, not fit enough, not big enough in terms of penis size,” went one morose litany). According to research by Debby Herbenick, how people feel about their genitals predicts sexual functioning—and somewhere between 20 and 25 percent of people, perhaps influenced by porn or plastic-surgery marketing, feel negatively. The business of labiaplasty has become so lucrative, she told me in an email, “that you will actually see billboards (yes, billboards!) in some cities advertising it.”

I don't know what it's like in schools and gyms nowadays, but I can confirm that in the 1960s we got naked together at the end of every school day while showering after sports, and in the summer while changing into/out of swimwear at public beaches.