Who came up with kissing? Seriously?
Did 2 people one day accidentally bash heads together and went like, “Oh… That was nice”
*violently bashes head together again*
“This should be a thing”
kissing is a method of exchanging saliva (and thus DNA) to determine whether or not you would want to reproduce with that person
*Bashes heads once more*
You are a prime candidate for my child.