(2006) found that women reported decreased sexual arousal and an increased likelihood of rejecting men's sexual advances when they shared more immune genes with their partners. But even after we have chosen a mate, these genes may continue to influence our attraction to our partners. There is evidence that heterosexual women are likely to marry men with immune genes which are different from their own (Ober et al., 1997, as cited by Garver-Apgar et al., 2006). Evolutionarily speaking, it is useful to mate with a partner who possesses immune genes unlike our own in order to enhance the immunity of future offspring. Major histocompatibility complex (MHC) genes in our immune system unconsciously influence our sexual desires. We do not often think about the possibility that our genetic background impacts our attraction to others however, our genes can have a significant impact on our sexual attraction to potential partners.
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