Kissing has long been a part of the human experience. If you think about it though, it’s an interesting phenomenon. Why do people kiss? Sometimes it’s for romance, sometimes for greeting, but it always signifies an important exchange between people. In some ancient cultures kisses played a very important role and often signified something along the lines of respect or agreement. Anthropologists themselves are not entirely clear on the origin of the kiss. However there are generally two camps of thought. The first camp believes that the kiss is an innate and instinctual behavior while the other camp claims it evolved out of something known as “kiss feeding”. You can probably deduce that this behavior refers to mothers pressing food into their infants mouth directly from their own. The earliest written references of the kiss come to us from Sanskrit texts that were written nearly 4,000 years ago. Some academics have claimed that the kiss spread to other parts of the world after Alexander the Great conquered parts of northern India. Whatever the history is, however, the kiss is here to stay. And whether you are kissing for love or just as a sign of greeting, these are 25 impressive and not so romantic facts about kissing!