According to a survey by the Employee Benefits Research Institute more women employees participate in their firm's 401(k) plan than men.
Women 401(k) participation rate = 55.5%
Men 401(k) participation rate = 53.8%
Perhaps more important is that those stats suggest almost half of all employees aren't saving for retirement.
The stats above are for full-time workers. The gap is even wider for part-timers: