Checkout The Health Benefit And Diseases Transmitted Through Kissing

Kissing not only feels good, it's good for you. It relieves stress and releases epinephrine into your blood, making it pump faster, which may result in a reduction of LDL lipids. Kissing may even be a novel way to receive certain hormones, like testosterone:

"'Mucous membranes inside the mouth are permeable to hormones such as testosterone. Through open-mouth kissing, men introduced testosterone into a woman's mouth,' which 'is absorbed through the ,mucous membranes… and increases arousal and the likelihood that she will engage in reproductive behavior."1

Interestingly, Andréa Demirjian, author of Kissing: Everything You Ever Wanted to Know about One of Life's Sweetest Pleasures, believes "a kiss a day really can keep the doctor away." And she recently shared eight reasons why with CNN

1.Reduce Your Blood Pressure
Kissing helps to dilate your blood vessels, which may help lower your blood pressure.

2.Relieve Cramps and Headaches
The blood-vessel-dilation effect described above also helps to relieve pain, particularly from headache or menstrual cramps.

3.Fight Cavities
When you kiss, saliva production increases in your mouth, and this helps to wash away plaque on your teeth that may lead to cavities. That said, cavity-causing bacteria can also be transmitted via a kiss, especially if the person you're kissing has poor oral habits. It's even been shown that cavity-causing bacteria can spread from a mother's kiss to her baby.3

4.Release Your Happy Hormones
Kissing prompts your brain to release a happy elixir of feel-good chemicals like serotonin, dopamine, and oxytocin. This isn't only important for your happiness, it also may also help to strengthen your relationship. As MSN reported:4
"'This [oxytocin] is the hormone of love, and the better the oxytocin levels, the more capacity for love,' explains psychotherapist Arthur Janov, Ph.D., author of 'The Biology of Love' and the director of the Primal Center in Santa Monica, Calif. 'We have found that those who cannot commit in a love relationship are low in oxytocin.'"
Interestingly, kissing activates the same areas in your brain linked to reward and addiction.5 According to the researchers who revealed this finding:6
"Kissing may have evolved as a way to stimulate brain systems associated with sex drive, romantic love, and attachment so that humans are triggered to seek a variety of potential mates, then focus attention on one for mating, and finally be able to tolerate that mate long enough to raise a child as a team."
Your lips are also densely packed with sensory neurons, which are stimulated by the touch of another's lips. This prompts the release of sebum, which is thought to play a role in bonding.7

5.Burn Calories
It's not going to replace your workout session… but a vigorous kiss may burn 8-16 calories. Not too shabby for a kiss.

6.Boost Your Self-Esteem
One study found that men who received a passionate kiss before they left for work earned more money.8 This suggests the kiss (and perhaps the happy home-life it suggests) makes people happier, boosts self-esteem and, ultimately, more productive at work.

7.Tone Your Facial Muscles
A vigorous kiss helps you shape up your neck and jawline by working out a number of facial muscles.

8.Check Out Your Partner's Compatibility
A kiss can be a powerful measure of your initial attraction to a person, so much so that the majority of men and women surveyed reporting that a first kiss could be a turn-off. Women, in particular, place more importance on kissing as a "mate assessment device" and as a means of "initiating, maintaining, and monitoring the current status of their relationship with a long-term partner.source
However, kissing can also be a very bad idea as it can be a means of spreading some infections like:

 - Mononucleosis
This disease, usually caused by the Epstein-Barr virus (EBV), spreads through saliva and is often referred to as “mono” or “the kissing disease.” Symptoms are very similar to those of the flu and include a fever, sore throat, fatigue, muscle weakness and swollen lymph glands.

The infection and related symptoms usually last anywhere from one to two months. Young people between the ages of 15 and 30 and those who regularly come into contact with a lot of people are the most at risk. While no treatment for mononucleosis exists, resting, staying hydrated and taking over-the-counter pain medications often help.

- Cytomegalovirus
Cytomegalovirus (CMV) is a virus in the herpes family. This disease spreads through saliva, as well as through blood, urine, semen and breast milk. Like all herpes viruses, CMV can remain dormant in the body for long periods of time, especially if you’re healthy.

Though this virus can infect almost anyone, symptoms usually appear in those with compromised immune systems. Symptoms can include fatigue, fever, muscle aches and, in more serious cases, pneumonia, encephalitis, seizures and visual impairment. While there’s no cure for CMV, treatment for the virus generally isn’t needed in healthy children and adults.

- Gum Disease
Bacteria, mucus and other particles constantly live in our mouths and can build up to form plaque. Brushing and flossing helps get rid of plaque, though if not cleaned thoroughly, plaque can build up under the gum line and cause gum disease. Though gum disease (also known as periodontitis and gingivitis) does not spread through kissing, the bad bacteria that cause it can. Brushing and flossing your teeth regularly is your best defense

Source: Yakshub