" Even by day, and in a place of public resort,
when her lover shows her any mark that she may have inflicted on his body, she should
smile at the sight of it, and turning her face as if she were going to chide him, she should show him with an angry look the marks on her own body that have been made by him.
Thus if men and women act according to each other's liking, their love for each other will
not be lessened even in one hundred years. "

― , The Kama Sutra of Vatsyayana