You could tell your significant other or a total stranger that this is all being done in the name of science. Kissing is so much more than just the romance we see on the silver screen. There is an actual science to the whole process.
Something that seems so simple on the outside is a lot more complicated on the inside. Get ready for just a touch of science and whole lot of common sense and you too will understand one of the most hard to understand concepts in the universe.