The frequency of divorce rises in polygamous marriages compared to monogamous relationships. Anthropologists tend to believe humans are neither completely monogamous nor completely polygamous. Mallards are generally monogamous while domestic ducks are mostly polygamous. For this reason many considered Spartan women polygamous or polyandrous. Often, cryptic female choice occurs in polyandrous or polygamous species. Polygynous primates have the highest sexual dimorphism, and polygamous and monogamous primates have less. Two-spirited people also can take part in marriages, either monogamous and polygamous ones. Debates of legalizing polygamous marriages continue in Central Asian countries. Polygamous marriages are not recognized in Russia. But Mizrahi Jews are not permitted to enter into new polygamous marriages in Israel. In the Lovedu case, this female husband may take a number of polygamous wives. Male mating behavior is also affected in response to the practice of polygamous behavior. In polygamous species there is a noted sexual dimorphism. Indigenous populations of Australia have been noted to engage in polygamous relationships. Anna Jai remained the matriarch in the polygamous family.