There are but three things worth employing one's right hand for, according to Fentimans. One would be the 'partaking' of a Fentimans brew, and the other would be furtling. Furtling was a form of entertainment enjoyed by the Victorian upper classes that I have been informed was:
"a wondrous erotic journey into the human hand's secret folds and
furrows, one that delivers pleasure most vitalizing, lifts melancholy
from the desponding mind, and restores wounded spirits. "
Confused? Let these pictures help clear things up a bit. You place your hand behind a picture in a certain way that it mimics the arse. It certainly beats drawing a moustache on your hand. Hats off to the Victorians for their brilliant sense of humour - I wonder if you can somehow make your arse look like a hand?