" Happiness both given and received is mutual enjoyment. For this shared happiness and pleasure, a man is willing to give himself entirely. For a man as for a woman, the total gift of self is a source of wonderful happiness and luck. Sexual intercourse is not merely a pleasure of the senses: more important is the sacrifice of oneself, the gift of self. To understand the mystery of sexual intercourse, to know and make use of what is fitting is the essential difference between man and beast. "

― , The Kama Sutra of Vatsyayana