I think you're missing the focus. Obviously, catering dinners for employees at 8:15 PM has created an environment that encourages sexual harassment, otherwise this would never have been included in an investigative report. An example, which isn't given in the report, is a male employee taking a female employee to a catered dinner after work hours and making advances.
Regardless of how a company drains the life out of its employees with overtime, if they create 'perks' that married people can also participate in, or a larger bunch, there is less risk of this happening.
The advice about dinner catering is in the context of reducing sexual harassment in the workplace and has nothing to do with anything else.