One fascinating discovery is the major histocompatibility complex (MHC) which is a group of genes that are related to immunity. Studies suggest that people are often attracted to other with different MHC genes.
Having a difference in these genes between 2 partners is ideal due to stronger immune systems in offspring and greater genetic diversity. In a famous experiment, women rated the scent of T-shirts worn by men and preferred those with different MHC profiles.
Attraction involves brain chemistry. Neurotransmitters such as dopamine (reward and pleasure), oxytocin (bonding), and testosterone & estrogen (sexual attraction). These are influenced by genetics and environment.
Your environment plays a role in your attraction which is shaped by personal experiences, culture, and social context.
National Human Genome Research Institute
“Genome Editing.” Genome.gov, National Human Genome Research Institute, https://www.genome.gov/about-genomics/policy-issues/Genome-Editing. Accessed 24 Apr. 2026.
Nature
Cyranoski, David. “CRISPR-Baby Scientist Fails to Satisfy Critics.” Nature, vol. 564, 2018, pp. 13–14.
World Health Organization
Human Genome Editing: Recommendations. World Health Organization, 2021, https://www.who.int/publications/i/item/9789240030381
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