Married life is not for sex indulgence. The principle of marriage is on the background of getting good children. So the householder is allowed to have sex life once in a month, just after the menstrual period. The menstrual period prolongs at least for 5 days, so after this 5 days, one can have sex life provided he desires to get a child. And as soon as the wife is pregnant, no more sex life, until the child is born and is grown up at least for 6 months. After that, one may have sex life on the same principle. If one does not want more than one or two children, he should voluntarily stop sex life. But one should not strictly use any contraceptive method and at the same time indulge in sex life. That is very much sinful. If the husband and wife can voluntarily restrain by powerful advancement of Krishna Consciousness. That is the best method. It is not necessary that because one has got wife, therefore you must have sex life. The whole scheme is to avoid sex life as far as possible. And if one can avoid it completely then it is a great victory for him. Married life is a sort of license for sex life on condition of raising children. So you should try to understand these principles of married life and use your discretion. You should not imitate great personalities like Bhaktivinode Thakura, but you must follow His footprints. But it is not always possible to have the same success as great personalities like Bhaktivinode Thakura achieved. So in all circumstances you should try to follow the footprints of authorities but never to imitate
them.

From Srila Prabhupada's Letter to: Satsvarupa  —  San Francisco 20 September, 1968