Dating service for scientists
By having singles send in saliva samples, the site facilitates a laboratory analysis of each person's immune system type and, using this data, claims to create optimized “physical chemistry” or "sexual chemistry" between people based on the sweaty T-shirt study, a pattern, discovered in 1995, which finds that people are most attracted to the smell of people who have the most-dissimilar immune system.
 The site was conceived by Holzle, a long-time internet site dater, after watching a TV discussion on the findings of the sweaty T-shirt study.
Chemistry matches people based on their personality type.
"Developers of matching algorithms have tended to focus on the information that is easy for them to assess, like similarity in personality and attitudes, rather than the information that relationship science has found to be crucial for predicting long-term relationship well-being.
 In 2008, was the fourth largest online dating site, based on number of singles available; largely due to a successful ad campaign targeting e Harmony (#5 largest dating site) and their anti-gay Christian-only, who regect people who aren't happy all the time (adjacent video).
But after spending countless hours scanning tiny pixelated squares of people who were supposed to represent my mathematically determined soul mate, I found that online dating websites are modern-day versions of snake oil.The researchers worry that searching for potential mates start to resemble shopping."For years, the online dating industry has ignored actual relationship science in favor of unsubstantiated claims and buzzwords, like 'matching algorithms,' that merely sound scientific," Finkel said.(CBS) - Scientists want you to think twice before doubling down on online dating services. "To date, there is no compelling evidence that any online dating matching algorithm actually works," Finkel said in a press release.A new study published in the upcoming issue of Psychological Science in the Public Interest is shedding light on the science - or lack thereof - behind online dating services. "If dating sites want to claim that their matching algorithm is scientifically valid, they need to adhere to the standards of science, which is something they have uniformly failed to do.
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The theory of desired dissimilar immune system matching can be quantified according to markers on a person’s major histocompatibility complex (MHC), a large gene region that controls the immune system response, and postulates that couples attracted to this type of scent owing to the result that a resultant child would create a more robust immune system, more defensive against a greater variety of pathogens.