The two markers tested for are the serotonin uptake controller, which is involved in how people handle positive and negative emotions.The second marker tested for relates to the genes influencing the person's immune system.The site recently sued a convicted sex offender in California who tried to register himself as an eligible bachelor.But is one of the few online dating websites to actually run background checks on its members, even though a recent survey found that a majority of people visiting online dating sites believed that most did.But experts, law enforcement officials and private investigators warn that the world of internet romance is fraught with peril, ranging from liars to sexual predators and even murderers, who hide their motives behind seemingly innocuous virtual identities."When we pushed for more stringent background checks on online dating sites, one company told us the idea of asking for disclosure was creepy," said Bill Noble, the director of the Safer Online Dating Alliance.The site, Singld Out.com, works by mailing out DNA testing kits to their customers, who then spit in a tube and send it back.The tube is then sent to a lab, where it is tested for the presence of two genetic markers.
"A lot of couples have found each other on the internet and not everyone is a predator," Mr Noble said.
"There are a lot of people out there who get jazzed up by disguising themselves," he said, adding that nearly 100 per cent of his cases involved women being victimised by men.
Industry experts say the website is unique in the field for warning on its home page that criminals and married men who come hunting "will be sorry if they do".
Two months later Craigslist was hit with another scandal when it emerged that a North Carolina man used the site to hire a man to rape his wife while the husband watched.
Bill Warner, a Florida private investigator who offers on his website to "sort out the winners from the losers" for a flat fee of US9 (Dh620), says running background checks on potential internet dates now constitutes more than 50 per cent of his business.
Women who had never met any of the men then smelled each t-shirt, rating the odors from most pleasant to least pleasant.