People have always believed that "birds of a feather flock together, and people flock together", so they are more willing to choose those who are similar to themselves as partners, but a latest study shows that people are actually more willing to choose those who are similar to themselves. People with different genes mate to increase the immunity of their offspring.

Professor Maria Greca Picaro of the Federal University of Paraná in Brazil studied 152 married couples. He found that among the genes of 90 married couples, a certain chromosome Genes in critical regions are very different.

This gene called major histocompatibility complex (MHC) is part of the immune system, and this is the first time scientists have found that this gene may play an important role in marriage. Picaro said the subconscious mind of having healthy offspring is important when choosing a mate.

Researchers also believe that in addition to helping the body overcome diseases, MHC genes may also have a subtle impact on body odor, and body odor is also a key factor in determining whether opposite sexes are attracted to each other.

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