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In addition to increasing the hormones in your brain, kissing can also decrease your level of cortisol, otherwise known as the stress hormone, according toPenn Medicine. Furthermore, pupil dilation is a sign of attraction, as noted by Healthline. Aug. 15, 2007. Scientists use genetic rewiring to increase lifespan of cells, Beyond amyloid and tau: New targets in developing dementia treatments, Napping longer than 30 minutes linked to higher risk of obesity and high blood pressure, Activity 'snacks' could lower blood sugar, complication risk in type 1 diabetes, In Conversation: Investigating the power of music for dementia, shallow breathing or difficulty breathing, headaches that occur more often than usual, dry, cracked skin at the corners of the mouth and lips, cytotoxic drugs, which doctors use to treat cancer, tetracyclines, which doctors use to treat bacterial infections, products containing fragrances, preservatives, or metals, medicated ointments, such as 5-fluorouracil and Solaraze, liquiritin, which is a compound derived from licorice, fungal extracts, such as kojic acid and lignin peroxidase, niacinamide, which occurs in root vegetables, limiting sun exposure and wearing a lip balm with sunscreen, eating a balanced diet that contains a range of nutritional foods, a skin lesion that bleeds, grows quickly, does not heal, or is tender to the touch. On the other hand, if they appreciate your kissing technique, they will stay planted right up next to your face and you won't feel their head pushing on your hand," explained Green. The fact is, most of us have developed a particularly fondness for kissing. Precancerous actinic keratosis legions usually feel tender or painful to the touch, and they may appear red or inflamed. Please copy/paste the following text to properly cite this HowStuffWorks.com article: Josh Clark & Brion O'Connor Of course, you could consider the obvious route: eating healthier, whole foods, reducing your red meat intake, exercising with greater frequency, and maybe taking a doctor-prescribed medication, as recommended by the Mayo Clinic. Fuller Darkening of the lips can be the result of hyperpigmentation. Iron deficiency anemia. By clicking Sign up, you agree to receive marketing emails from Insider "The (mostly) blissful history of 'kissing.'" A peck on the lips is quite different than a hot and heavy, full-body, tongue-thrusting make-out session, after all.