According to the Vedic system, marriages between kṣatriyas and kṣatriyas or between brāhmaṇas and brāhmaṇas are the general custom. If marriages sometimes take place between different classes, these marriages are of two types, namely anuloma and pratiloma. Anuloma, marriage between a brāhmaṇa and the daughter of a kṣatriya, is permissible, but pratiloma,marriage between a kṣatriya and the daughter of a brāhmaṇa, is not generally allowed. Therefore Mahārāja Parīkṣit was curious about how Śukrācārya, a powerful brāhmaṇa, could accept the principle of pratiloma. Mahārāja Parīkṣit was eager to know the cause for this uncommon marriage.
(Srimad Bhagavatam-----9:18:5-----purport).

When Nahuṣa, who had six sons, was cursed to become a python, his eldest son, Yati, took sannyāsa, and therefore the next son, Yayāti, was enthroned as king. By providence, Yayāti married the daughter of Śukrācārya. Śukrācārya was a brāhmaṇa and Yayāti a kṣatriya, but Yayāti married her nonetheless. Śukrācārya's daughter, named Devayānī, had a girl friend named Śarmiṣṭhā, who was the daughter of Vṛṣaparvā. King Yayāti married Śarmiṣṭhā also. The history of this marriage is as follows. Once Śarmiṣṭhā was sporting in the water with thousands of her girl friends, and Devayānī was also there. When the young girls saw Lord Śiva, seated on his bull with Umā, they immediately dressed themselves, but Śarmiṣṭhā mistakenly put on Devayānī's clothes. Devayānī, being very angry, rebuked Śarmiṣṭhā, who also became very angry and responded by rebuking Devayānī and throwing her into a well. By chance, King Yayāti came to that well to drink water, and he found Devayānī and rescued her.
(Srimad Bhagavatam-----9:18:---summary).

While taking Devayānī out of the well, King Yayāti must certainly have appreciated her youthful beauty, and therefore he might have asked her which caste she belonged to. Thus Devayānī would have immediately replied, "We are already married because you have accepted my hand." Uniting the hands of the bride and bridegroom is a system perpetually existing in all societies. Therefore, as soon as Yayāti accepted Devayānī's hand, they could be regarded as married. Because Devayānī was enamored with the hero Yayāti, she requested him not to change his mind and let another come to marry her.
(Srimad Bhagavatam-----9:18:20-----purport).

Kaca, the son of the learned celestial priest Bṛhaspati, had been a student of Śukrācārya, from whom he had learned the art of reviving a man who has died untimely. This art, called mṛta-sañjīvanī, was especially used during wartime. When there was a war, soldiers would certainly die untimely, but if a soldier's body was intact, he could be brought to life again by this art of mṛta-sañjīvanī. This art was known to Śukrācārya and many others, and Kaca, the son of Bṛhaspati, became Śukrācārya's student to learn it. Devayānī desired to have Kaca as her husband, but Kaca, out of regard for Śukrācārya, looked upon the guru's daughter as a respectable superior and therefore refused to marry her. Devayānī angrily cursed Kaca by saying that although he had learned the art of mṛta-sañjīvanī from her father, it would be useless. When cursed in this way, Kaca retaliated by cursing Devayānī never to have a husband who was a brāhmaṇa. Because Devayānī liked Yayāti, who was a kṣatriya, she requested him to accept her as his bona fide wife. Although this would be pratiloma-vivāha, a marriage between the daughter of a high family and the son of a lower family, she explained that this arrangement was made by providence.
(Srimad Bhagavatam-----9:18:22-----purport).

According to the Vedic system, the parents would consider the horoscopes of the boy and girl who were to be married. If according to astrological calculations the boy and girl were compatible in every respect, the match was called yoṭaka and the marriage would be accepted. Even fifty years ago, this system was current in Hindu society. Regardless of the affluence of the boy or the personal beauty of the girl, without this astrological compatibility the marriage would not take place. A person is born in one of three categories, known as deva-gaṇa, manuṣya-gaṇa and rakṣasa-gaṇa. In different parts of the universe there are demigods and demons, and in human society also some people resemble demigods whereas others resemble demons. If according to astrological calculations there was conflict between a godly and a demoniac nature, the marriage would not take place. Similarly, there were calculations of pratiloma and anuloma. The central idea is that if the boy and girl were on an equal level the marriage would be happy, whereas inequality would lead to unhappiness. Because care is no longer taken in marriage, we now find many divorces. Indeed, divorce has now become a common affair, although formerly one's marriage would continue lifelong, and the affection between husband and wife was so great that the wife would voluntarily die when her husband died or would remain a faithful widow throughout her entire life. Now, of course, this is no longer possible, for human society has fallen to the level of animal society. Marriage now takes place simply by agreement. Dāmpatye 'bhirucir hetuḥ (S.B.12:2:3). The word abhiruci means "agreement." If the boy and girl simply agree to marry, the marriage takes place. But when the Vedic system is not rigidly observed, marriage frequently ends in divorce.
(Srimad Bhagavatam-----9:18:23-----purport).

In the beginning of these affairs concerning Śarmiṣṭhā and Devayānī, we saw that Śarmiṣṭhā had many friends. Now these friends became maidservants of Devayānī. When a girl married a kṣatriya king, it was customary for all her girl friends to go with her to her husband's house. For instance, when Vasudeva married Devakī, the mother of Kṛṣṇa, hemarried all six of her sisters, and she also had many friends who accompanied her. A king would maintain not only his wife but also the many friends and maidservants of his wife. Some of these maidservants would become pregnant and give birth to children. Such children were accepted as dāsī-putra, the sons of the maidservants, and the king would maintain them. The female population is always greater than the male, but since a woman needs to be protected by a man, the king would maintain many girls, who acted either as friends or as maidservants of the queen. In the history of Kṛṣṇa's household life we find that Kṛṣṇa married 16,108 wives. These were not maidservants but direct queens, and Kṛṣṇa expanded Himself into 16,108 forms to maintain different establishments for each and every wife. This is not possible for ordinary men. Therefore although the kings had to maintain many, many servants and wives, not all of them had different establishments.
(Srimad Bhagavatam-----9:18:29-----purport).

The word svāminam is significant. Svāmī means "caretaker" or "master." Devayānī was cared for by Śukrācārya before her marriage, and after her marriage she was cared for by Yayāti, but here the word svāminam indicates that Devayānī left the protection of her husband, Yayāti, and returned to her former protector, Śukrācārya. Vedic civilization recommends that a woman stay under the protection of a man. During childhood she should be cared for by her father, in youth by her husband, and in old age by a grown son. In any stage of life, a woman should not have independence.
(Srimad Bhagavatam-----9:19:8-----purport).

While hunting in the forest, Duṣmanta once approached the āśrama of Mahāṛṣi Kaṇva, where he saw an extremely beautiful woman and became attracted to her. That woman was the daughter of Viśvāmitra, and her name was Śakuntalā. Her mother was Menakā, who had left her in the forest, where Kaṇva Muni found her. Kaṇva Muni brought her to his āśrama, where he raised and maintained her. When Śakuntalā accepted Mahārāja Duṣmanta as her husband, he married her according to the gāndharva-vidhi. Śakuntalā later became pregnant by her husband, who left her in the āśrama of Kaṇva Muni and returned to his kingdom.
(Srimad Bhagavatam-----9:20:---summary).

In her reception of Mahārāja Duṣmanta, Śakuntalā clearly said, "Your Majesty may stay here, and you may accept whatever reception I can offer." Thus she indicated that she wanted Mahārāja Duṣmanta as her husband. As far as Mahārāja Duṣmanta was concerned, he desired Śakuntalā as his wife from the very beginning, as soon as he saw her, so the agreement to unite as husband and wife was natural. To induce Śakuntalā to accept the marriage, Mahārāja Duṣmanta reminded her that as the daughter of a king she could select her husband in an open assembly. In the history of Āryan civilization there have been many instances in which famous princesses have selected their husbands in open competitions. For example, it was in such a competition that Sītādevī accepted Lord Rāmacandra as her husband and that Draupadī accepted Arjuna, and there are many other instances. So marriage by agreement or by selecting one's own husband in an open competition is allowed. There are eight kinds of marriage, of which marriage by agreement is called gāndharva marriage. Generally the parents select the husband or wife for their daughter or son, but gāndharva marriage takes place by personal selection. Still, although marriage by personal selection or by agreement took place in the past, we find no such thing as divorce by disagreement. Of course, divorce by disagreement took place among low-class men, but marriage by agreement was found even in the very highest classes, especially in the royal kṣatriya families. Mahārāja Duṣmanta's acceptance of Śakuntalā as his wife was sanctioned by Vedic culture.
(Srimad Bhagavatam-----9:20:15-----purport).

When Śakuntalā responded to Mahārāja Duṣmanta's proposal with silence, the agreement was complete. Then the King, who knew the laws of marriage, immediately married her by chanting the Vedic praṇava (oṁkāra), in accordance with the marriage ceremony as performed among the Gandharvas.
The oṁkāra, praṇava, is the Supreme Personality of Godhead represented by letters. Bhagavad-gītā says that the letters a-u-m, combined together as oṁ, represent the Supreme Lord. Religious principles are meant to invoke the blessings and mercy of the Supreme Personality of Godhead, Kṛṣṇa, who says in Bhagavad-gītā that He is personally present in sexual desires that are not contrary to religious principles. The word vidhinā means, "according to religious principles." The association of men and women according to religious principles is allowed in the Vedic culture. In our Kṛṣṇa consciousness movement we allow marriage on the basis of religious principles, but the sexual combination of men and women as friends is irreligious and is not allowed.
(Srimad Bhagavatam-----9:20:16----translation and purport).

The son of Andhaka named Kukura was the origin of the descendants known as Vahni, Vilomā, Kapotaromā, Anu, Andhaka, Dundubhi, Avidyota, Punarvasu and Āhuka. Āhuka had two sons, named Devaka and Ugrasena. The four sons of Devaka were known as Devavān, Upadeva, Sudeva and Devavardhana, and his seven daughters were Dhṛtadevā, Śāntidevā, Upadevā, Śrīdevā, Devarakṣitā, Sahadevā and Devakī. Vasudeva married all seven daughters of Devaka. Ugrasena had nine sons named Kaṁsa, Sunāmā, Nyagrodha, Kaṅka, Śaṅku, Suhū, Rāṣṭrapāla, Dhṛṣṭi and Tuṣṭimān, and he had five daughters named Kaṁsā, Kaṁsavatī, Kaṅkā, Śūrabhū and Rāṣṭrapālikā. The younger brothers of Vasudeva married all the daughters of Ugrasena.
Vidūratha, the son of Citraratha, had a son named Śūra, who had ten other sons, of whom Vasudeva was the chief. Śūra gave one of his five daughters, Pṛthā, to his friend Kunti, and therefore she was also named Kuntī. In her maiden state she gave birth to a child named Karṇa, and later she married Mahārāja Pāṇḍu.
Vṛddhaśarmā married the daughter of Śūra named Śrutadevā, from whose womb Dantavakra was born. Dhṛṣṭaketu married Śūra's daughter named Śrutakīrti, who had five sons. Jayasena married Śūra's daughter named Rājādhidevī. The king of Cedi-deśa, Damaghoṣa, married the daughter of Śūra named Śrutaśravā, from whom Śiśupāla was born.
(Srimad Bhagavatam------9:24:--summary).