More than 60 percent of young men are single, nearly twice the rate of unattached young women, signaling a larger breakdown in the social, romantic and sexual life of the American male. Men in their 20s are more likely than women in their 20s to be romantically uninvolved, sexually dormant, friendless and lonely. They stand at the vanguard of an epidemic of declining marriage, sexuality and relationships that afflicts all of young America.