All across Africa, the Pacific and the Americas, we find cultures that didn't know about mouth kissing until their first contact with European explorers. And the attraction was not always immediately apparent. Most considered the act of exchanging saliva revolting.
The word philosophy sounds high-minded, but it simply means the love of wisdom. If you love something, you don't just read about it; you hug it, you mess with it, you play with it, you argue with it.