National Population Policy of India, 2000, for the first time recognized the need of active involvement of men in family planning so that if men are educated about reproductive health issues or female reproductive physiology then they are more likely to support their partners in decision-making process on contraceptive use and family planning which may be essential for women to avoid unprotected sex or unwanted pregnancy. Limited number of studies which include men as a part of sexual and reproductive health are found in India. Thus this book tries to examine the perspective of men in relation to their background characteristics on woman's physiology and risk of pregnancy if she has sexual relations during menstrual period and breastfeeding.