aquanude 

a person that is not a nudist except when swimming, at the beach or in a hottub.

John is a true nudist, where his aquanude wife only gets nude in public when swimming.

aquanude by Armand Angelina June 2, 2009

aquanudity 

aquanudity-(awk-wah-NEW-ditty) Vt-Any act or experience that simultaneously involves water and a distinct lack of clothing. Ex. "My shower was such a wonderful session of aquanudity!"

Tom's enjoyment of aquanudity has almost risen to the level of fetish.

aquanudity by Tom "Shake" Aquafreak June 7, 2005