Why do men and women stick out their tongues when kissing? Methods and skills of French kissing

Tenderness: reflected in a gentle mood. The technique is to gently hold each other's upper lip with your lips, while sliding between each other's lips with your tongue, wetting each other's lips with saliva, and repeating after changing the lower lip. After the other person's lips open a little, touch the tip of the tongue with your tongue, stop when you feel the other person's heart beating faster, look at each other affectionately, and then continue to kiss repeatedly.