Husbands , how can you understand your wives and have a happy marriage

This book contains 3 main topics :

Understanding PMS, Estrogen & Menopause

How women behave when they are having mood swing 

What can husband do , when their wives is upset , to have a happy marriage 

The information contain is just a summary of the topics mention so that it can be understood easily . It does not contain detail explanation with all the scientific medical terms.