Lads mooning casually in front of everyone is my favourite thing. At uni the head lecture was retiring and one of the other lecturers just asked some of the guys in the class to stand outside the media school (name of building) and show their arses for photo for her leaving photo album they were putting together.
There'd be all kinds of complaints and lawsuits and issues over safeguarding if genders were reversed. Instead "She's 60 and might get a thrill over seeing 18 year old lads bare bums so line up whilst we get the camera out"