The popular dating website has tens of millions of users around the globe and claims that the marriages it engenders last longer and are more contented than normal. It bases its matches between singles on compatibility traits. “This is the problem”, one genetics researcher, Dr. Tsung Foo of Apple Fertility Clinic, a new app for the iPhone, professes, “since compatibility is not a natural human species mating trait. That is not how sex works.”
Geneticists argue that it will inevitably lead to species homogeneity in generations to come which will threaten extinction. How? Personality compatibility is realized only when there is sameness regarding human attributes.
If an individual is attracted to and paired with another with the same attributes this will result in the genes of those attributes being dominant, thus eliminating genes of unlike attributes – especially if the children take up the practice of compatibility mating, and owing to the success of eHarmony this is very likely. Without crossbreeding of dissimilar attributes the gene pool will shrink.
“This is the point of sex”, says Foo, “for the sake of species survival the largest and most diverse gene pool is desired. That means steering away from homogeneity. It is a fundamental rule of Natural Selection.”
“If humans seek individual compatibility, breeding those traits will result in amassing together homogenous sub-groups who think and feel alike,” Tsung Foo asserts.
“These sub-groups would enlarge as more individuals would find their home within them and continued to breed. In time, under the pressure of competition, only a few would dominate. But ultimately, individuals within these large sub-groups would become as similar as say, Bison. The sub-group populations will be as vulnerable as them. Sure Bison are handsome creatures that have the same tastes in food and lifestyles, and did very well proliferating to a dominant species position on the open plains in huge numbers. But look where they are today.”
Does Nature want us to look for so close a compatible mate? Not if you consider my parents, or probably yours. They did speak the same language, which at times appeared to be the only question they would answer compatibly on eHarmony’s questionnaire.

There is of course a need for similarity for couples so that there is a degree of comfort, encouraging them to relax together and increasing their shared experiences.  But without contrasting qualities this can become bland, boring & encourage unconsciousness.