If information from words is "1", information from saliva is as much as "200 million". People feel comfortable with the scent of those with different immune systems, increasing the chance of healthier offspring. Kissing is a place for scent information exchange, instinctively choosing a partner. Being licked all over and wrapped in saliva massively secretes happiness hormones, said to make you 5 years younger. Drowning in drool, wrapped in a woman's mucous membranes with a sloppy kiss, and finally reaching the peak of pleasure with a handjob... There is no greater happiness than this.