The case has been recorded of a Russian who had the spontaneous impulse to self-flagellation on the nates with a rod, for the sake of sexual excitement, from the age of 6. (Rivista Mensile di Psichiatria April, 1900, p. 102.)
Κρυπτάδια, vol. v, p. 358. As regards the use of nettles, see Dühren, Geschlechtsleben in England, Bd. II, p. 392.
Debreyne, Mœchialogie, p. 177.