You're Sharing More Than Love: Couples Share Up To 30% Of Their Gut BacteriaIf you've been living with your partner for a while, it turns out you're sharing more than a home, meals and Netflix passwords. Research shows that couples who live together share between 13% and 30% of their gut bacteria, as well as 38% of their oral microbiome and even 35% of the bacteria on their feet. Our microbiome is the collection of bacteria, viruses and fungi that live in and on our bodies, and it plays an important role in digestion, immunity and overall health. Living together, kissing, sleeping in the same bed and sharing the same environment all influence the microbes we carry. When it comes to kissing, a 10-second kiss can transfer up to 80 million bacteria. The more often couples kiss, the more similar their oral microbiomes become. Fortunately, most of these bacteria are harmless, and many actually help protect our bodies. Researchers also found that the skin microbiome is the most similar between couples, with shared bacteria found on the hands, feet, eyelids and other parts of the body. Simply sleeping in the same bed and living in the same environment can lead to these similarities.