Opposites attract in terms of disease fighting genetic variability
Wherever you look, the reasons behind genetic variability seem to have something to do with infectious disease.
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men and women most prefer (or least dislike) the body odour of members of the opposite sex who are most different from them genetically. Wederkind and Füri looked at MHC genes on chromosome 6, which are the genes involved in the definition of self and the recognition of parasitic intruders by the immune system.
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Only women on the contraceptive pill failed to show a clear preference for different MHC genotypes in male-impregnated T-shirt armpits. But then the pill is known to affect the sense of smell.
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