Research from various institutes has shown that attraction could be genetically based. Past studies have shown that attraction is strongly related to smell. Now, researchers have found that women prefer the scent of men who have immune systems dissimilar to their own, as measured by genes for the major histocompatibility complex (MHC), which is involved in displaying antigens to immune cells. Other studies have found that men also prefer women with dissimilar MHC genes, more specifically known as human leukocyte antigen (HLA) genes in humans. Various companies are now offering, at a high price, genetic love matching. By sampling DNA they can find compatibility by matching those couples with the most dissimilar MHC and HLA genes. These companies extract DNA from swabs of cheek cells, then analyse three key MHC or HLA genes. As we inherit a copy of each gene from each of our parents, six alleles are analysed, of which there are hundreds of common types. The companies believe that greater dissimilarity predicts greater compatibility. It is said that these genetically matched couples are promised a better sex life, more orgasms, a lower risk of cheating on each other, higher fertility and healthier children. They can also predict rate of conception, miscarriages and health of children.
http://www.newscientist.com/article/mg20026873.600-dna-dating-can-genes-help-you-pick-a-mate.html
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