Maybe something with this?
Regarding human attraction, evolutionary theory suggests that individuals may be subconsciously drawn to partners with dissimilar MHC genes. This preference is often mediated by body odor, as MHC genotypes influence the scent of sweat and other bodily fluids. Choosing a partner with different MHC alleles increases the likelihood that offspring will inherit a diverse set of immune genes, potentially enhancing their pathogen resistance and overall fitness.