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This approach draws on a study performed by Claus Wedekind and colleagues at the University of Bern in Switzerland, who asked female volunteers to smell T-shirts that had been worn by men for three consecutive days and to rank them by attractiveness (Wedekind , 1995).

It turned out that the majority of the women were attracted to men whose immune systems differed most from their own—fulfilling the maxim that ‘opposites attract'.

These websites use a range of personality tests and psychological assessments to build lists of traits that individuals seek in an ideal partner.

Yet, in this modern era of personalized genomes and DNA-based crime fighting, the new generation of online dating services has added one more parameter: biology.

What accounted for the immune system differences at the genetic level were sequences in the genes encod-ing the human leukocyte antigen (HLA).

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