People pick their mates based more often on the traits they share rather than those that make them different.As Stephanie Pappas at Live Science reports, similar mate traits come from across the spectrum of human experience: When it comes to marriage, the adage “birds of a feather flock together” is more on-point than the idea that opposites attract. Domingue and his colleagues attempted to find out whether this assortative mating happens at the genetic level. Some genetic testing companies are promising to match couples based on the DNA testing, touting the benefits of biological compatibility." said Eric Holzle, founder of Scientific Match.com, one of the first online dating sites to use DNA.Holzle wouldn't reveal membership numbers, but Gene Partner, a Swiss company that works with matchmakers and dating sites, has tested more than 1,000 people, according to chief scientific officer Tamara Brown.
Instant Chemistry and Singld Out are not the first to promote genetic testing to determine romantic compatibility.
Unlike some direct-to-consumer genetic testing companies (such as those claiming to offer genetically tailored nutritional supplements, which have been subject to enforcement by the Federal Trade Commission for deceptive claims), there is some legitimate science behind the new DNA-matching dating websites.
While genetics seems to play some role in human sexual attraction, it clearly is not the only, or even predominant, factor determining human mate choice.
In fact, it was just a third of the size of the effect you find when looking at similarity of education level in couples.
The education-based assortative mating effect is the most widely studied mating effect in the scientific literature.