Why do we kiss?
In: Biology
Everyone has a unique immune system.
When kissing, your brain is learning what the other person’s immune system is like. Ideally, you want someone who has a different immune system than you, because your progeny will have a wider immunological coverage.
[There’s some study](https://www.scientificamerican.com/article/birth-control-pills-affect-womens-taste/) into women’s preferences for men changing depending on whether or not they are on birth control. The essential argument is that women’s brains want genetically diverse men to father their children, but genetically similar men to raise them. Because the pill forces a woman’s body to perpetually think it’s pregnant, this can lead to a shift in preference after she’s off it.
TL;DR
Kissing is you testing your mate’s immune system for the survival of your potential future spawn. Snog accordingly.
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