With the help of smell, we can recognize the major histocompatibility complex (MHC), which is important in the immune system. As a rule, the more diverse the MHC genes of the parents are, the stronger the immunity of the offspring is. Scientists know that animals like mice and rats can determine how genetically related they are to other members of their species by sniffing each other’s urine. Humans also have this skill, but fortunately, the smelling of urine is not required for it.

Swiss biologist Claus Wedekind is known for his “research of a sweaty T-shirt.” The study asked men to wear the same T-shirt for 2 days without using deodorant, cologne, or scented soap. Then different women were asked to smell these clothes and point out the options that were most attractive to them. The results showed that women are most attracted to men with an MHC that is as different as possible from their own.

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