When the Lord appears in this universe in the form of a human being, He has two purposes, as stated in Bhagavad-gītā (BG 4.8)—paritrāṇāya sādhūnāṁ vināśāya ca duṣkṛtām: to destroy the demons and protect the devotees. To protect the devotees, the Lord not only satisfies them by His personal presence but also teaches them so that they will not fall down from devotional service. By His personal example, Lord Rāmacandra taught the devotees that it is better not to enter married life, which is certainly followed by many tribulations. As confirmed in Śrīmad-Bhāgavatam (7.9.45):
The men of the higher classes—the brāhmaṇas, kṣatriyas and vaiśyas—do not beget children in the wombs of lower-class women. Therefore the custom in Vedic society is to examine the horoscopes of a girl and boy being considered for marriage to see whether their combination is suitable. Vedic astrology reveals whether one has been born in the vipra-varṇa, kṣatriya-varṇa, vaiśya-varṇa or śūdra-varṇa, according to the three qualities of material nature. This must be examined because a marriage between a boy of the vipra-varṇa and a girl of the śūdra-varṇa is incompatible; married life would be miserable for both husband and wife. Consequently a boy should marry a girl of the same category. Of course, this is trai-guṇya, a material calculation according to the Vedas, but if the boy and girl are devotees there need be no such considerations. A devotee is transcendental, and therefore in a marriage between devotees, the boy and girl form a very happy combination.
In human life there are four principles to be fulfilled-dharma, artha, kāma and mokṣa (religion, economic development, sense gratification, and liberation). First one should be religious, observing various rules and regulations, and then one must earn some money for maintenance of his family and the satisfaction of his senses. The most important ceremony for sense gratification is marriage because sexual intercourse is one of the principal necessities of the material body. Yan maithunādi-gṛhamedhi-sukhaṁ hi tuccham (SB 7.9.45). Although sexual intercourse is not a very exalted requisite in life, both animals and men require some sense gratification because of material propensities. One should be satisfied with married life and not expend energy for extra sense gratification or sex life.
Just like I have several times said, the marriage is sense gratification, sex life. But somebody may say... They say that "Marriage is legalized prostitution." It may be, but still, there is some control. Although it is called "legalized prostitution," there is no difference between prostitution and married life, but there is some control. People become responsible. By responsible life, they can make advance. Irresponsible life will not help. Therefore loke vyavāyāmiṣa-madya-sevā nityā hi jantoḥ. So our tendency for sense gratification is controlled. Therefore it is called license. Gṛhastha life means a license for sense gratification. But we must know that sense gratification means material life. It may be systematic or not systematic. Sense gratifications means material life. But our aim is to transcend this material life and come to the spiritual life, platform of spiritual life. That is required. So there are so many processes.
But there are different orders of social society: brahmacārī, gṛhastha, vānaprastha, sannyāsa. The whole process is to restrict. But gṛhastha, householder means giving a little license who cannot completely restrict sex life. That's all. Gṛhastha does not mean unrestricted sex life. If you have known this married life like that, that's a wrong conception. You have to control if you want to get out of this diseased condition of life. You cannot get out of disease and unrestrictedly go on enjoying your senses. No. That is not possible. Yad indriya-prītaya āpṛṇoti na sādhu manye yata ātmano 'yam asann api kleśada āsa dehaḥ (SB 5.5.4). Those who are indulging unrestrictedly in sense enjoyment civilization, that is not good. Because that will lead him to accept next again this material body. Maybe human body or animal body or any body. But he has to accept this body. And as soon as you accept this body then you'll have to undergo the threefold miseries of the body. Birth, death, old age, diseases. These are the symptoms of threefold miseries.