Mobay is right, I've never heard of anything like that either. The famlies do family stuff during the day and tend to depart the island when the night time debotchery starts. However if you're going to stay the night there's no rule against bringing your own sitter if you want to indulge in the bar scene.
Commanding officer, "Our 3 Sons"
Vodka drinking specialist and
the Ambassodor of pun-tang