What is biting his lip when kissing?

Biting the lip during kissing can be a sensual and passionate gesture. It can show that the person is fully engaged in the kissing and wants to intensify the experience. It can also be a way to show dominance or playfulness during the interaction. However, it is important to communicate with your partner and make sure that both parties are comfortable with the level of biting. Too much or too aggressive biting can cause discomfort or pain.