Kissing a partner on the lips often makes more of an emotional statement than kissing him or her on the genitals, even if the latter usually feels better. Perhaps this is why when a relationship starts to go sour, couples will usually stop kissing on the lips long before they stop having intercourse.

There are reasons why kissing can be more intimate than getting into a partner’s pants. From the moment we are born, most of us are kissed by moms, dads, aunts, uncles, grandparents, and anyone else whose approaching lips we can’t successfully dodge. Being kissed symbolizes a profound love that we hopefully come into the world experiencing.

Another reason for the added power of kissing is so many of the major senses—vision, smell, hearing, and taste—have their outlets on the human face. Not to mention the lips and skin are exquisitely sensitive to touch. The face is so full of sensory centers that we have terms such as “You’re in my face” or “Get out of my face” to express annoyance or social discomfort.

Guys will worry about the size of their penises when they should be worrying about how well they kiss.