Birth Control
“The discovery of the brief, limited window for a woman’s ability to conceive during her menstrual cycle automatically gives rise to the natural, and therefore real, solution to the great problem of contraception, for this consists merely in temporary abstinence during the time when the woman is fertile.”
Die periodische Fruchtbarkeit und Unfruchtbarkeit des Weibes.
Der Weg zur natürlichen Geburtenregelung
Die periodische Fruchtbarkeit und Unfruchtbarkeit des Weibes.