Dating direct affinity offers
While some research has supported the theory that MHC gene diversity drives human attraction, other studies have reported different or conflicting results.
A few studies have found that humans prefer sexual partners with only moderately different or even similar MHC variants, others have found that MHC diversity is detected by facial shape rather than smell, and still more have found that women in committed relationships are most attracted to men with different MHC alleles.
Given that all mammals display similar genetic mechanisms, one might expect a similar genetic attraction to exist in humans, albeit within the context of the greater complexity of human relationships.
While genetics seems to play some role in human sexual attraction, it clearly is not the only, or even predominant, factor determining human mate choice.