Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. Sex is the central fact of life, and owing to the urgent necessity for enlightenment upon a subject that greatly affects, directly or indirectly, every member Of society, prudery and mawkish modesty should be disregarded. When others do not intelligently dis cuss delicate matters regarded as peculiarly intimate, personal and shameful, it becomes a part of the physician's duty so to do.