Lips are important for many reasons, but there are two main ones. Firstly, they allow us to form words and sounds in order to communicate verbally. Secondly, they allow us to communicate in a much more personal and non-verbal way. Lissing is one of the greatest things invented. From a mother kissing her child's booboo better, to lovers who kiss like their lives depended it, kissing is a wonderful way of expressing feeling.
I couldn't find any pictures which were suitably humorous, so instead I'll give you two men with very kissable lips. One for we Illya girls, and one for the Napoleon girls.