1. In 1909, the heroine of Ermanno Wolf-Ferrari’s Il segreto di Susanna sneaks away to her bedroom. In the orchestra, a flute figure ascends. Then the secret that Susanna keeps from her husband reveals itself:

2. In 1914, shortly before the Great War begins, a premonitory piece of literature asks men to consider how comforting it would be, under the circumstances, to suck and suck and suck, “natural like.”

3. Theory explains the gender differential.

Source of the tobacco advertisement: Cosmopolitan, May 1914, from