erectile calestetics
See: Jerking off, walking the dog, flogging the dolphin, whackin' it, spankin' the monkey, wanking off, beatin' the meat, beat the pud, get your chili whacked, hand job, masturbate, lubing the shaft, choke the chicken, bash the bishop, slap the salami, stroke the trouser snake, doin' it with Palmala Handerson, Rosie Palms, grow some hair on your hands, lather the lolly, etc.
He went to practice his erectile calestetics.