SB 7.12.11
etat sarvam grhasthasya
samamnatam yater api
guru-vrttir vikalpena
grhasthasyartu-gaminah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
All the rules and regulations apply equally to the householder and the sannyasi, the member of the renounced order of life. The grhastha, however, is given permission by the spiritual master to indulge in sex during the period favorable for procreation.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
It is sometimes misunderstood that a grhastha, a householder, is permitted to indulge in sex at any time. This is a wrong conception of grhastha life. In spiritual life, whether one is a grhastha, vanaprastha, sannyasi or brahmacari, everyone is under the control of the spiritual master. For brahmacaris and sannyasis there are strong restrictions on sexual indulgence. Similarly, there are strong restrictions for grhasthas. Grhasthas should indulge in sex life only in accordance with the order of the guru. Therefore it is mentioned here that one must follow the orders of the spiritual master (guru-vrttir vikalpena). When the spiritual master orders, the grhastha may accept sex life. This is confirmed in Bhagavad-gita (7.11). Dharmaviruddho bhutesu kamo ’smi: indulgence in sex life without disobedience to the religious rules and regulations constitutes a religious principle. The grhastha is allowed to indulge in sex life during the period favorable for procreation and in accordance with the spiritual master’s order. If the spiritual master’s orders allow a grhastha to engage in sex life at a particular time, then the grhastha may do so; otherwise, if the spiritual master orders against it, the grhastha should abstain. The grhastha must obtain permission from the spiritual master to observe the ritualistic ceremony of garbhadhana-samskara. Then he may approach his wife to beget children, otherwise not. A brahmana generally remains a brahmacari throughout his entire life, but although some brahmanas become grhasthas and indulge in sex life, they do so under the complete control of the spiritual master. The ksatriya is allowed to marry more than one wife, but this also must be in accordance with the instructions of the spiritual master. It is not that because one is a grhastha he may marry as many times as he likes and indulge in sex life as he likes. This is not spiritual life. In spiritual life, one must conduct one’s whole life under the guidance of the guru. Only one who executes his spiritual life under the direction of the spiritual master can achieve the mercy of Krsna. Yasya prasadad bhagavat-prasadah. If one desires to advance in spiritual life but he acts whimsically, not following the orders of the spiritual master, he has no shelter. Yasyaprasadan na gatih kuto ’pi. Without the spiritual master’s order, even the grhastha should not indulge in sex life.