as men had more than one sambandham partner at the same time, that "both men and women could have several partners at once, and either party was free to break the relationship, for any reason or for none, whenever they wished." He believes that both polyandrous sambandhams and hypergamy were most common in Central Kerala. In northern Travancore there appears not to have been as great a prevalence of hypergamy because of a relative scarcity of Brahmins living there. Fuller believes that in the relatively undocumented southern Travancore monogamy may have been predominant, and that although the matrilineal joint family still applied it was usually the case that the wife lived with the tharavad of her husband. Nancy Levine and Walter Sangree state that while Nair women were maritally involved with a number of men, the men were also married to more than one woman. The women and their husbands did not live together and their relationship had no meaning other than "sexual liaison" and legitimacy for the children. Gough has gone further than Fuller with regard to the interpretation of events in the north, believing that there is no evidence of polyandry in that area at all. She argues that all European travelogues describing polyandry came from the region of Central Kerala. Gough notes the differing personal experiences of earlier Nair commentators and that this could go some way to explaining the varied pronouncement: Panikkar, who queries the existence of polyandry, comes from the northern Travancore region; that A. Aiyappan, who acknowledges its existence, comes from Central Kerala; and that both have based their writings on customs they grew up with in their very different environs. Decline of traditional practices The practices of thalikettu kalyanam, the polyandrous sambandhams, and also the existence of large tharavads declined during the nineteenth century, as did that of hypergamy. Monogamy and small nuclear family units became the norm, as they were elsewhere in the country. This process occurred more rapidly in some areas than in others, and in Central Kerala the traditional systems still lingered as late as the 1960s, although hypergamy had largely disappeared everywhere by the 1920s. A possible reason for the various rates of change across the region lies in the extent to which the various agrarian local economies were dominated by the Nairs. V. K. S. Nayar has said that, "the matrilineal system tends to produce a society at