One kiss transfers more than 80 million germs. When Dua Lipa said, “One kiss is all it takes,” she meant more than just falling in love. In one 10-second French kiss, over 80 million microbes are transferred between partners. Sounds pretty icky, but scientists think kissing may boost the immune system through shared bacteria. Similarly, people in long-term relationships were found to have the same bacteria in their mouths. How sweet!