In their heyday the Pet Shop Boys were the Interpol of the Eighties dressing up to sing really weird pop songs about lust and loneliness in the big city. They're low-pro now not retro-worshipped in the manner of Depeche Mode New Order or The Cure but you can hear the reason why - these guys are too sad.
Study after study confirms that even when you control for variables like profession education hours worked age marital status and children men still are compensated substantially more - even in professions like nursing dominated by women. No wonder there's a gender gap.