Note CZ — Chapter XXI · SEX-HYGIENE FOR ADULTS
Reading edition
Hensen (Physiologie der Zeugung) concludes from statistics compiled from 284 cases wherein the day concarnationis was known, that the greatest number of conceptions follows the act practised in the days immediately after menstruation. The chances of conception following the act practised during menstruation are increased the nearer the catamenial period is approaching its end. The number of conceptions after the act practised before menstruation, Hensen found to be the smallest.