I'm on a 40 hour week. By law they can not ask you to work longer without overtime in most states, and can not fire you if you refuse. This applies even to exempt workers. The 60 hour work week is self imposed although many companies will mislead workers on this account. If an exempt worker voluntarily works longer hours management will tend to fill in that extra time with more tasks, at which point trying to shrink back down again becomes a problem. The places that do tend to have the longer hours are startups, which are places to avoid if you want to have a life or sanity or a steady salary. It is true that this may make you look like the slacker, especially at a place the values quantity over quality, but blame your coworkers for setting false expectations.
The corporation is not the type of place for prospective fathers either! This is 2015, not 1950. Today fathers are parents also, they need to share in the child rearing. Ward Cleaver needs to take time off from the office before the Beaver becomes a delinquent. Besides, June Cleaver has a day job too because that's the only way to afford a house in California. After a new baby, dad needs paternity leave as well. I see no difference between male or female in this regard.