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If a woman’s use of oral contraceptives is congruent, meaning she was using oral contraceptives when she met her partner, her current preference will more closely match the preference that shaped her partner choice in the first place, and the desire is higher than that of a woman whose use of oral contraceptives is in-congruent.

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presented evidence for HLA-dissimilar alleles playing a factor in the healthiness of romantic relationships.

They discovered that as the proportion of HLA-similar alleles increased between couples, females reported being less sexually responsive to their partners, less satisfaction from being aroused by their partners, and having additional sexual partners (while with their current partner). conducted an independent study on a population of American Hutterites by comparing the HLA alleles of married couples.

This is due to the psychological processes that shape the formation and maintenance of human romantic relationships are influenced by variation in hormonal levels.

Due to their high hormone content, oral contraceptives have the potential to alter women’s partner preference for a range of male traits, which could have important consequences on sexual relationships, as it alters women’s attraction to their partner and, potentially, to other men.

This inbreeding avoidance hypothesis proposes that biases towards heterozygotic alleles prevent harmful genetic consequences which can arise from mating with genetic family members. Studies have shown that women who are at the most fertile stage of their menstrual cycle prefer the smell of men that have higher testosterone levels.

Heterozygosity of HLA can also be detected through scent: in this case, heterozygosity confers greater ability to recognize a wider variety of antigens.

They discovered that females were attracted to men who had dissimilar HLA alleles from them.

Furthermore, these females reported that the body odors of HLA-dissimilar males reminded them of their current partners or ex-partners providing further evidence of biological compatibility.

Females not using non hormonal contraceptives were more attracted to the scent of males with dissimilar MHCs.

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