L. Deslandes, A Treatise on the Diseases Produced By Onanism…
“ When we think of the power of the act of venery, and consider that it may be indulged in as often as an individual chooses, and that if the legitimate mode of indulgence, the concurrence of the sexes is denied, the individual may abuse himself; when we reflect we say on all this, we may fearlessly assert that most of the inconveniences and diseases afflicting the human species, arise from venereal excesses.We have hitherto considered masturbation and coition abstractedly and as if there were no circumstances to change the influence they exercise. ”
