The science of kissing is called philematology.
On July 5-6, 2005 a couple in London locked lips for 31 hours, 30 minutes, and 30 seconds, making it the longest kiss ever recorded.
More Kiss Facts
On the average, a person spends 20,160 minutes (two weeks) of his life on kissing.
Sensitivity of the lips is 200 times higher than that of the fingers.