Well according to this site
Ice Cubes Down My Cleavage, or, The Coldtitz Story was transmitted part of the I.S.I.R.T.A. show transmitted on 23-12-73.

Good God, that was 29 years ago when I was young(-ish) and handsome (I don't think many 'catters knew me then to be able to deny it - except for Breezie).