Last year, I got engaged to my boyfriend of seven years.

Last week, I took a DNA test to see just how genetically compatible we are.

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- That the fertility rates are higher for genetically compatible couples.

- That genetically compatible couples have healthier children with stronger immune systems.

Here’s the wording from the website*: Research shows that children born to couples with very different immune system genes are more likely to successfully defend themselves against a greater variety of infections.

But not only does scientific evidence point to children with strong immune systems, the research has shown that these couples also enjoy more satisfying sex lives, greater marital stability increased fertility rates and find each other more attractive. Singld Out believes that their biological testing should work the same for gay people, but they are in the process of testing to get to the same accuracy as they have with heterosexual couples.

Alongside a quiz-based personality test (which the company describes as “highly accurate”), Singld Out is also measuring biological compatibility with the help of a company called Instant Chemistry.

They do this by looking at specific parts of the genetic code, including the Human Leukocyte Antigen system and the serotonin transporter gene.

Three genes within the HLA system are said to be crucial to biological compatibility, affecting the makeup of our immune system as well as the pheromones we put off in the world.

According to Instant Chemistry, the pheromonal attraction we experience to other people is actually our instincts informing us of who has a different immune system (on a genetic level) than we do.

Once you get your results you can start testing your compatibility against other people. Some providers already have a database of people who’re looking to test their against others.