In the past, men demonstrated their manliness at work by mooning the trading floor (to quote one conversation I had recently) or pounding their chests à la Alpha-Ape (to quote someone I interviewed a few years back).  ”Come back with your shield or on it,” a partner used to joke in the 1980s whenever someone in my husband’s BigLaw firm went to court. Extreme schedules remain a key metric of manliness.  ”He’s a real man; he works 90-hour weeks. He’s a slacker; he works 50 hours a week,” commented a Silicon Valley engineer.