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Effects of relationship status on MHC-correlated odour preferences. (a) Differences in partnership desirability ratings of MHC-similar and MHC-dissimilar male body odours by 42 single and 43 paired women. The interaction is significant (p=0.033). (b) Effect of the frequency with which women fantasize about sex with other men (p=0.080). Filled bar, MHC-similar male body odour; open bar, MHC-dissimilar male body odour.
