Why is humans be keen to steal affection?

【Write in the end】

The performance of DRD4 genes in different groups is different. The most common is the 4R version, and about 65%of them carry this gene.7R+genotypes are rare in people in East and South Asia, below 20%.It is very common in the Americas and Southeast Asia, and some areas can even reach 45%.

Regardless of whether it is a monogamy, or a multi -wife or multi -husband system, from the perspective of evolution, it is a choice of survival strategy for species to reproduce.Throughout the nature, only humans and very few animals such as gibbon and birds maintain a monogamy.But scholars have also found that even in these monogamy animals, infidelity behavior is very extensive.Therefore, some scholars believe that the monogamous system is the most basic reproduction strategy of human beings, while extramarital affairs and sex play some second or supplementary roles.

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