They’re also your most exposed erogenous (i.e.

Here’s something you may not have known.

If you do it right, kissing might keep you looking younger.

A couple kissing

(via The Journal) We’re not making this up.

When you lock lips with someone else, the muscles you engage form into the shape of a heart.

This, in turn, gives them a workout that may help reduce facial wrinkles.

Kissing burns calories

For best results, kiss longer and harder.

Science has yet to set standards for kiss sizes.

Mourier, meanwhile says that a “shy kiss” will engage 12.

It’s what Mourier calls the"long emotional ones"that exercise your entire face.

Kissing burns (some) calories and more

We know what you’re thinking.

We thought it, too.

If you’re eager to stop jogging, and start kissing instead, you might want to think twice.

Mourier’s research says that each kiss can burn up to three calories.

If you believe Mourier, kissing is good for your teeth.

The saliva you produce while kissing reduces plaque.