Erhard Loretan (3rd man to climb all 14 8k peaks) coined the phase 'naked night climbing', something I used to think was reserved to ascents of Tiptoe Ridge after a session in the Pines, but good so see it making a comeback.....
That was in the early '80s. 'Later that same decade' - but on the rock this time - Jon Redhead climbed 'Solvent Abuse' (E3 5b) in the LLanberis slate quarries in the nude - and with the rope tied around his bollocks, for extra encouragement not to fall off ...