I think that Carnival is the only cruise line that offers a topless deck. I have read many threads on the "thong". It all basically boils down to if you feel you want to wear it. For example there might be alot fo kids around the pool and the pools are close quarters so do you want to get up and have your rear in a kids face? On the other hand their is usually an all adult pool and I am sure that the guy sitting next to you would not mind at all!