The standard anthropological explanation of this custom is based in explications of the conflicts between descent and affinity in Balinese society.

Twin incest was a common feature of Balinese mythology.

As in many other mythologies, the Balinese deities frequently marry their siblings without any of the incest-related issues faced by similarly-situated human couples.

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In these stories, the brother usually wooed and wed his sister, who bore his child(ren), but on discovering that they are siblings, they are often (but not always) forced to part.

According to Tagalog mythology, Malakás ("strong") and Magandá ("beautiful"), the first humans on earth, were fraternal twins born of the same bamboo stalk.

An old Japanese myth says that if two star-crossed lovers commit dual suicide, they are reincarnated as fraternal twins.

Twin incest is a prominent feature in ancient Germanic mythology, and its modern manifestations, such as the relationship between Siegmund and Sieglinde in Richard Wagner's Die Walküre, and a feature in some Greek mythology, such as the story of Byblis and Kaunos.

Is it possible for twins to marry another pair of twins without being able to tell their spouses apart? For twin brothers Zhao Xin and Zhao Xun, who live in Shanxi, China, mistaken identity has been a problem since young.

For their wives, the similarity has also proven too much that they have had difficulty telling their husbands apart.

While in modern Western European culture such behaviour is considered taboo, incest between twins is a common feature in Indo-European, Asian (such as Japan, the Philippines, and Bali) and Oceanian mythology, and there are a few societies in which the prohibition on it is limited or it is partially accepted.

common for a set of twins of the opposite sex to marry each other, since it was assumed that they had sex in utero.

There are strong parallels between the Germanic portrayals of twin incest and those of the Balinese Ramayana, and some scholars have speculated an early Indo-European link.