Add all those elements and then combine them on a cruise ship where everyone will be together for several days, with few Wear protection if you have sex. Of the biggest cruise lines surveyed by the company at the end of last year, only six (Royal Caribbean, Norwegian Cruise Line, MCS Cruises. Thinking of a little hanky-panky on your cruise? Here are a few things to keep in mind. Two Brazilian passengers aboard the Allure of the Seas cruise ship a year-old girl to one of their rooms, forced her to perform oral sex on.