Thongs are not well accepted, even on ladies that have the figure to wear them, except maybe on the topless deck. If a male wears one he is generally looked upon with distain and might actually be asked to find something more approprate if in the general pool or lido area. Remember that while it may seem fine for you there are others onboard that do not wish for thier children to have an anatomy lesson. Consider if you had a daughter about 12 years old and some guy plops down beside her with nothing but a pouch covering him? Or a 12 yr old boy standing there when a lady with nothing on but a couple pasties and a tiny strip of cloth walks in front of him? We must all try and be considerate of others whenever reasonable and possible.