Materialistic way of life is that I have got nice senses, let me enjoy the senses to the fullest extent. That is materialistic way of life. Just like cats, dogs, and hogs. The hogs, whenever they are sexually inclined, they don't care for whether it is his mother or sister or this or that. You see? That is stated in the Śrīmad-Bhāgavatam: nāyaṁ deho deha-bhājāṁ nṛloke kaṣṭān kāmān arhate viḍ-bhujāṁ ye (SB 5.5.1). Viḍ-bhujām, viṭ means stool and bhujām means eater. So the stool-eater's sense gratification is not meant for this human form of life. Stool-eater means these hogs. The hogs sense gratification is not meant for this human form of life. Restriction. Therefore in the human form of life there is marriage system. Why? What is the marriage and prostitution? Marriage system means restricting sex life. Marriage system does not mean that you get a wife, ah, without any payment you go on unrestricted sex life. No, that is not marriage. Marriage means to restrict your sex life. He'll hunt for sex life here and there—no, you cannot do that. Here is your wife and that is only for child. It is restriction.