I lay on the narrow wood bench, twisting from one side to the other. My body was raw, twitching, tumescent, the junk-frozen flesh in agonizing thaw. I turned over on my stomach and one leg slipped off the bench. I pitched forward and the rounded edge of the bench, polished smooth by the friction of cloth, slid along my crotch. There was a sudden rush of blood to my genitals at the slippery contact. Sparks exploded behind my eyes; my legs twitched — the orgasm of a hanged man when the neck snaps.
— William Burroughs, Junky
*Junkie. Originally at least.