our lips. Several illnesses can be transmitted through kissing as body fluid (saliva) is transferred during kissing.
Overall, passionate kissing is known to have a number of health benefits, including forming strong emotional bonds, boosting in your metabolic rate (what a great way to lose weight!), and reducing measurable amounts of stress.
How can something so enjoyable be a bad thing?
The fact is, most of us have developed a particularly fondness for kissing. To explain it scientifically, during a kiss the brain produces the chemical oxytocin, a calming hormone which has been shown to establish bonds in humans. That prompts the limbic system's reward center to release the chemical dopamine, resulting in the pleasurable feelings we experience during kissing. In short, we get the same reaction from kissing that we might from chocolate and cocaine (but without the added calories or addiction risks).
Also....several bacteria can be transferred during kissing which can cause;
that can last up to a week & more if not taken care of!!!!