Gutenberg Literary Edition #6579

This book has been written at the request of the Student Christian Movement, and is addressed in the first place to men and women of the student age. I have undertaken the task with great gladness because my long and happy contact with men and women through the Student Movement has taught me how great is the need for a fuller understanding of the problems of sex, and how possible it is that men and women should find help through the timely suggestion of right and wholesome thoughts.

My brother, Dr. Charles Gray of London, has contributed a very valuable appendix dealing with certain facts in a way which is only possible to a medical man, and I am very greatly indebted to him for thus enriching this volume.

It will be apparent to all who read it that I also owe a great deal to many who have shared with me their knowledge and experience. In particular I owe much gratitude to a number of generous-hearted women who have enabled me to write the chapters which are more especially addressed to their sex.

I have deliberately omitted from these pages any reference to disease. I do that not because I am not impressed by the terrible penalties with which nature visits certain sins, but because I do not believe in the power of fear to deliver us. Though there were no such thing as venereal disease, immorality would still be a way of death, and morality would still be the way of life and joy. Till we perceive that we are not on the path of progress.