The Kama Sutra

When a lover coming home late at night kisses his beloved, who is asleep or in bed, in order to show her his desire, it is called a "kiss that awakens." On such an occasion the woman may pretend to be asleep at the time of her lover's arrival, so that she may know his intention and obtain respect from him.

When a person kisses the reflection of the person he loves in a mirror, in water, or on a wall, it is called a "kiss showing the intention."

When a person kisses a child sitting on his lap, or a picture, or an image, or figure, in the presence of the person beloved by him, it is called a "transferred kiss."

When at night at a theatre, or in an assembly of caste men, a man coming up to a woman kisses a finger of her hand if she be standing, or a toe of her foot if she be sitting, or when a woman is shampooing her lover's body, places her face on his thigh (as if she was sleepy) so as to inflame his passion, and kisses his thigh or great toe, it is called a "demonstrative kiss."

There is also a verse on the subject as follows:-"Whatever things may be done by one of the lovers to the other, the same should be returned by the other, _i.e._, if the woman kisses him he should kiss her in return, if she strikes him he should also strike her in return."