Why We Kiss
If you think about kissing as objectively as possible, it becomes weird very fast. In particular, the more intricate forms of kissing (like French kissing) can seem like it does little more than swap germs. So why do we do it? One of the most common theories is that mouth-to-mouth touching helps transfer information about physical health between partners. Our saliva carries all kinds of chemical information, and exchanging this directly might help us subconsciously evaluate each other to see if we are a good match for future mating. Kissing can also release many hormones that help us feel good, bond with our partner, and leave us wanting more.