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In fact, the research to date is all over the place.
It has long been known that other mammals, such as mice, selectively mate with partners having different genetic variants of their MHC genes, which control immune responses.
Genetics may be one factor to consider, certainly more relevant than astrology, psychic readings, or even material goods—such as the type of car someone drives—that some people rely on.
For existing couples, a psychological component is likely at play, in that a high or low genetic compatibility ranking could influence partners’ feelings toward each other.
A few studies have found that humans prefer sexual partners with only moderately different or even similar MHC variants, others have found that MHC diversity is detected by facial shape rather than smell, and still more have found that women in committed relationships are most attracted to men with different MHC alleles.
Some studies have also discovered that women on birth control pills tend to prefer men with the same MHC variants, the opposite of their peers not on the pill.
Yet, as noted above and as is common for most genetic research, especially as it relates to complex human behaviors such as love and romance, the data supporting genetic attraction is highly inconsistent.
DNA results become part of each user’s profile, and members can search for and evaluate potential matches based on their genetic compatibility.
Instant Chemistry and Singld Out are not the first to promote genetic testing to determine romantic compatibility.
In 2008, a company called Gene Partner began to offer genetic testing to identify relationship compatibility.
Applying a similar concept are “pheromone parties” in which singles sniff well-worn T-shirts worn by members of the opposite sex to facilitate biological matches based on pheromones, the elusive compounds of attraction.