Somewhere in the house I have a copy of the Baden Powell 1920s handbook for the Scouts called (I kid you not)" Scouting for Boys" complete with the chapter warning about the terrible effects of "Beastliness" (as it calls wanking)It causes Headaches and a general deterioriation in Health according to B-P and leads to degeneracy and dissipation.. well worth reading if you can find a copy and you can See here for more info