Spending a lot of time at the bar is the key. It also depends on what kind of cruise you're on. If you're on a family cruise the odds are way down.
But the people who proposition you aren't always going to be the people you'd want to have a threesome with.
She may have been to my parents' house. There's an attack squirrel that lives in their oak tree and throws acorns at the dogs so that phrase gets uttered often.