Kiss' Gene Simmons and his tongue - 1975. The most famous tongue of the 70s? Perhaps. Only the Rolling Stone's logo comes close.

First released in April of 1975, Kiss’s “Rock and Roll All Night,” from the album Dressed to Kill, rose to #57 on the Billboard chart. However, the song truly exploded six months later when a live version of the tune (from the Alive! L.P.) was released in October. Party everyday? Suuuure, why not. Go on, it’s good for ya.

Kiss Online (Official), Kiss Wiki