"Workmen, soldiers, and so on," Neisser remarks (Senator and Kaminer, Health and Disease in Relation to Marriage, vol. ii, p. 485), "can more easily find non-prostitute girls of their own class willing to enter into amorous relations with them which result in sexual intercourse, and they are therefore less exposed to the danger of infection than those men who have recourse almost exclusively to prostitutes" (see also Bloch, Sexualleben unserer Zeit, p. 437).
The character and extent of such lectures are fully discussed in the Proceedings of the Third Congress of the German Society for Combating Venereal Diseases, Sexualpädagogik, 1907.
I leave out of account, as beyond the scope of the present work, the auxiliary aids to the suppression of venereal diseases furnished by the promising new methods, only now beginning to be understood, of treating or even aborting such diseases (see, e.g., Metchnikoff, The New Hygiene, 1906).
Max von Niessen, "Herr Doktor, darf ich heiraten?" Mutterschutz, 1906, p. 352.