There’s a few reasons but the one I think is coolest is when we exchange saliva in a romantic way (like if your assaulted and spit on you’ll not notice it) our bodies will feel attraction due to the chemical exchange if they line up
It’s believed that when two people have opposite immune systems, that’s what “the spark” is. It’s like the body saying “if we make babies with them, they’ll be superior immunity wise” so the kiss seems different, more fun and arousing.
Kissing could be a function to see if two people are chemically compatible in order to make better healthier babies.
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