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Human and animal studies show that a group of genes called the major histocompatibility complex (MHC) can influence odor. In general, females prefer the odor of mates with a dissimilar MHC -- but this effect is reversed in women on oral contraceptive pills.
A study found that that single women preferred the odor of MHC-similar men, but women in relationships preferred the opposite. This means that that the use of contraceptive pills could influence mate preference.