What are some of the etiquette rituals about kissing in the past and present?

The performance of this etiquette is often combined with some degree of embrace. The parts of the body that people of different statuses kiss each other vary. Generally speaking, between husband and wife, lovers or lovers, it is appropriate to kiss the lips; between elders and juniors, it is appropriate to kiss the face or forehead; between equals, it is appropriate to face. In public, close relationships between women can kiss the face, between men and women can be close to the face, the elders can kiss the forehead, men can kiss their fingers or the back of the hand of the honored women. Certain tribal residents of Africa, often to kiss the feet of the chief or the chief walked through the place as an honor. In ancient Rome and ancient Persia and other countries, the same class of people can kiss the lips, different classes of people can only kiss the face.