Naked = a lot more bug bites :)
My kids immediately saw past the nudity and love this show. I was concerned about it at first but their only comments on the nudity are along the lines of "Ewww, look at all his bug bites," "Oh cool, they are using mud to cover their skin against sunburn," "Ouch, that fall had to hurt even more without clothes to protect you," etc.
My kids enjoy learning how to make fire without matches, build a shelter with only what is in your surroundings, filter/boil water to make it safe, etc. There is nothing funnier than my son, the city kid, critiquing the contestants' shelter design.