Depends on which island you are on. Most of the French islands have nude areas and a number of other places have topless areas and women that wear thongs. Onboard the ship topless is allowed only in a specific area near the funnel that is off-limits to kids. Many islands are quite religios and they do not allow nudity or toplessness. If you are more specific I can maybe help more. Understand that many other cultures also don't see nudity as equating to sex and it is no big deal on the beach.