They live as friend; that is sudra. There is no legal marriage, sudra and sudrani. Just like [Ajamila] was living with the sudrani — he was not married — as friend. So even sudra's marriage there is. For the sudra there is one asrama — that is grhastha asrama. And for the brahmanas, four asramas: brahmacari, grhastha, vanaprastha, sannyasa. This is for the brahmanas. For the ksatriyas: brahmacari, grhastha, vanaprastha. For the vaisya: brahmacari and grhastha. And for the sudras: no brahmacari, only family life, and that also sometimes without marriage. This is the low grade, first grade, second grade.

So now to live as friend, as sudra, that is now current all over the world. Now marriage is being forgotten. That is also written the sastra, that "There will be no more marriage. One man and woman should live together by agreement." That is going on now in Kali-yuga. Svikaram eva hy udvahe, it is stated. Simply agree: "Yes, you become my bedfellow; I become your bedfellow." That's all. Svikaram eva hy udvahe. That is marriage. No more that ceremonial marriage. That is being forgotten. This is Kali-yuga now. Dampatyam eva hi… Ratim eva hi dampatye: "And their so-called unity, man and woman, means sex." There is no other meaning. Dampatye, union of man and woman, means sex. There is no other religious system, I mean, that husband, wife live together; they should cooperate for advancing in Krsna consciousness. These things are being forgotten.

So Kali-yuga, these things are very common, but in the previous yuga, Satya-yuga, they were not very common, but rare. This combination of the brahmana and the sudrani, this is accidental. It is not common. So anyway, accidental or organized, it doesn't matter. One who violates the rules and regulation, immediately he comes to the category of such classification. So he became a sudra. Although he [Ajamila] was born in a brahmana family, he was being trained up, but on account of the association of a sudrani, prostitute, he fell down and he became a papah, most sinful man. So as a papah, he did not know how to earn money honestly. He is neither brahmana, nor ksatriya, nor vaisya. He is now not even sudra; less than that.

From Srila Prabhupada's lecture on Srimad-Bhagavatam 6.1.66 — September 2, 1975, Vrndavana