Plain Facts for Old and Young by John Harvey Kellogg

7. The time of sexual congress is always determined by the condition

and desires of the female. An additional fact, as stated by physiologists, is that, under normal conditions, the human female experiences sexual desire immediately after menstruation more than at any other time. It has, indeed, been claimed that at this period only does she experience the true sexual instinct unless it is abnormally excited by disease or otherwise. From these facts the following conclusions must evidently be drawn:--