According to Vedic culture, the women are instructed or trained up to become very chaste. Very chaste. Only one husband. Why? That is explained: strisu dustasu varna-sankarah bhavisyati. If women do not remain chaste, then unwanted population will come out. That is called varna-sankarah. Varna-sankarah means unwanted population. Actually all over the world this is happening, and therefore, the problems of the world becoming very serious and grave.
Srila Prabhupada, Pandal Lecture — November 20, 1971, Delhi