The song that is called I DIG SEX in the DT (IDIGSEX) is actually THE WONDERFUL WORLD OF SEX by Steve Goodman. I have verified this by listening to a sound sample at Allmusic.com.

There is a thread about the song here: Chords Req: Wonderful World of Sex (Steve Goodman).

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Note from Joe Offer: this song was written by Michael Smith, recorded by Steve Goodman.