Track 11 of 12 on the album Automatic For The People.
In the liner notes of 'In Time: The Best of R.E.M.' (2003) guitarist Peter Buck says that this is the only R.E.M. song where the lyrics came before the music. Lead singer Michael Stipe told Buck & bassist/ keyboardist Mike Mills he had written a full set of lyrics & maybe they could find some suitable music. When the band returned to the studio, Mills played a piece on the piano which fit Stipe's lyrics perfectly.
The song is supposedly about swimming naked at night (or 'skinny dipping') but many have their own interpretations. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.