Which muscle is referred to as the "kissing muscle" that purses the lips?

The orbicularis oris is known as the "kissing muscle" because it is responsible for the movement of the lips, allowing actions like pursing, closing, and shaping the lips for various activities, such as kissing and speaking. This circular muscle encircles the mouth, playing a crucial role in facial expressions and oral functions. Its contraction brings the lips together, creating the pursed appearance typically associated with kissing, which emphasizes its role in expressing affection and intimacy. The muscle's unique positioning and structure enable it to perform effectively in these actions, making it central to facial dynamics.