Kissing On The Mouth -

: The earliest recorded textual references to kissing appear in Mesopotamia and Egypt dating back to at least 2500 B.C.E.

: The act can increase heart rate, dilating blood vessels and potentially lowering blood pressure. Kissing on the Mouth

: A passionate kiss can transfer approximately 80 million bacteria , acting like a "probiotic" that strengthens the immune system. : The earliest recorded textual references to kissing