Garbhādhāna-saṁskāra means when you are going to make your wife pregnant, there is saṁskāra, there is ceremony. And especially in the Brāhmaṇa families, if there is no garbhādhāna-saṁskāra, he immediately becomes a Śūdra. This is the śāstric . . . you must follow the saṁskāra. Saṁskārād bhaved dvijaḥ janmanā jāyate śūdraḥ. One who follows the saṁskāras, then he becomes purified. This is, this is called dharmāviruddhaḥ, "Not against the religious principles."
So if we do not follow the principles, then we are animals, that's all. That is the difference between the animal and man. If you do not follow the regulative principles enjoined in the śāstras . . . yaḥ śāstra-vidhim utsṛjya vartate kāma-kārataḥ, kāma-kārataḥ, na sukhaṁ sāvāpnoti (BG 16.23). Because we do not follow the śāstric injunction, therefore we are thinking that, "Population is increasing; let us use contraceptive method." The so-called contraceptive method is there because we are having sex life against religion. Against religion. But if you have sex life in, I mean, pursuance of the religious principle, you don't require. Because to become father and mother is not restricted, but to become father and mother of cats and dogs is restricted. To become father and mother is not restricted. That is nature. You become father of hundreds children. But don't produce cats and dogs. Then there will be . . . then dharmāviruddhaḥ . . . and there will be unwanted population, problem, fight, no peace, no tranquillity. Everything, all, it will be hell.