Swapping spit can mean major damage to your lips. Learn how too much kissing can put you at risk for chapped lips and much more.

While saliva can damage the lips, it also plays an important role in kissing. It contains several hormones that are transferred from kisser to kisser, one of which is testosterone. This hormone has been shown to increase sexual desire and physical sensitivity in both men and women [source: Blackwell Publishing ].

When the saliva left over from a lot of kissing evaporates from your lips it takes with it the natural moisture and oils that help protect the delicate skin there. This can lead to dry, cracked, and chapped lips (via Consumer Health Digest). Your best defense, in this scenario, is a good offense.

Research has shown that couples who continue to kiss passionately throughout their long-term relationships report higher levels of relationship satisfaction and sexual satisfaction.

It’s common to experience some lip pain or discomfort after an intense kissing session. Though usually harmless, a sore or swollen lip can put a damper on your romantic encounters. Understanding the causes and treatments for post-kissing lip pain can help you get back to smooching safely.