Crazy facts about kissing you never knew

The importance of kissing in relationships is well-documented. In fact, research shows that 59 percent of men and 66 percent of women have found themselves less attracted to a potential partner after a bad first kiss; further, Butler University's John Bohannon surveyed 500 people and found that most people can remember up to 90 percent of the details of a first romantic kiss. That's a lot of pressure during the early days of courtship, no?

Whether you refer to it as smooching, snogging, tonsil hockey, or making out, here are some crazy facts about kissing you likely never knew, from the surprising health benefits of locking lips to details on the first-ever kiss in film history.