"So Clive, if the BA, and the local authorities brought in a new rule stating that your company would be liable for a hefty fine and compensation if you were to hire a boat to a large all male/female crew, who then went on to cause disturbance, offence or even damage throughout their holiday, what would your policy be regarding these type of groups, would you still hire to them?"
Now that's just the sort of thing that rattles my cage! Why oh why should a company be held responsible for the behavior of adults?