First mention of kiss in writing

The Kama (desire) Sutra (type of verse) lists over 30 types of kisses, such as "fighting of the tongue".

The most important muscle in kissing is the orbicularis oris, also known as the kissing muscle, which allows the lips to "pucker".
French kissing involves all 34 muscles in the face. A pucker kiss involves only two.

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.