a sex cruise.... Now there is a idea. Who has $12 billion lying around so that we can build a nudist cruise ship...?? That shit would make money.
The problem is it never ends up the way you/we want. It's always 80% fat old men and 20% fat old women, not exactly the type of swinging we are looking for. If you put an age limit of 30 and under and weight limit's I'm sure it would not take long to be sued.