Because of all the negative energy we take in during the day, it's a very positive benefit." All in all, kissing and everything it engenders keeps us going strong, living long, says Stamford."The process of being active -- and that can include kissing, sex, and any other whole-body activities -- that's what keeps you healthy." Sex, sensuality, and sensual touch have profound effects on well-being, says Joy Davidson, Ph D, psychologist and clinical sexologist in Seattle, and former columnist for an online column called "Underwire." "Kissing is an exciting excursion into the sensual," Davidson tells Web MD."By the time you're kissing someone, you're right up next to them, you are in their personal space," she says. You're also learning quite a bit about them -- you touch them, smell them, taste them, see the expressions on their face, learn something about their health status, learn a great deal about their intentions." The brain contains "a huge amount of receptors devoted to picking sensations from the lips," Fisher says.

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If things were really hot and heavy, you might be looking at a caloric expenditure similar to a brisk walk." But don't confuse great sex with a cardiovascular workout, he says. that's just adrenaline." Tension relief -- that's what good lovin' brings, says Stamford.

"People tend to have the misconception that anything that raises your heart rate has the same effect as jogging, so it must be good for fitness. "Sex and love are probably the Rodney Dangerfield of stress management.

J., and author of several books, including The Sex Contract and Anatomy of Love. Two males will kiss, two females will kiss, a mother and child will kiss on the lips.

They don't choose mates; it's whomever they're interacting with." Kissing is a very investigatory process, Fisher explains.

They think someone has pounded them with their fist, because there aren't many receptor sites for nerve endings." Why? They direct a baby toward milk; they helped our ancestors -- for millions of years -- to discern whether their food was poisonous or not.

"The mouth is absolutely essential to survival -- everything passes through there, and if it's the wrong thing, you're cooked," she says.

"Still, I would not go around advocating kissing after meals instead of brushing," he says.

A serious, tongue-tangling French kiss exercises all the underlying muscles of the face -- which some say could keep you looking younger, and certainly looking happier.

Face it -- a great kiss makes the world dissolve, makes us dizzy with desire.

"Kissing is passion and romance and what keeps people together," says Michael Cane, author of The Art of Kissing, who "lectures" on kissing at colleges around the country.

It's the same biological mechanism that triggers milk flow during nursing.