The skin on your lips is three to four times thinner than the skin on the rest of your face. With all the fun things you do with your lips (eat, kiss, lick, etc...), they can dry out. You need to keep them soft and smooth. If not for yourself, then for those your lips come into contact with.
Keep your kisser hydrated and protected with a good product like NIVEA MEN Replenishing Lip Balm. It contains intensive moisturizers and nourishing ingredients like Vitamin E and Hop Extracts. Plus the Broad Spectrum SPF 15 formula helps protect lips from damaging effects of the sun.