WHY is a partner's smell essential? People tend to have physi | Why?

WHY is a partner's smell essential?

People tend to have physiological tools for capturing and evaluating a partner's odor, and this evaluation, without going into neurophysiology, "flies past" the intermediate stages of analysis, and is immediately perceived as "pass" or "fail”.

Further on, the person considers as an optimal sexual partner only those who received a "pass" at the first stage. It is connected with a number of mechanisms, which are beneficial for obtaining the healthiest offspring.

Due to a complex biochemical system, our smell translates information about the immune properties and composition of the microbiome. Typically, for healthy offspring, we need to combine the most different immune combinations and "befriend" the microflora, so we like people who have the most different "invisible characteristics" from ours.