If from the perspective of western theology, human reproduction and continuation, it is really the credit of incest. In those days, Mr. Lord made only one man and one woman, Adam and Eve. Then, the person concerned asked aloud, “who? Who did Adam and Eve’s children marry? From the perspective of human history, incest also leaves deep traces in the footprints of human development. From gathering to forming tribes linked by blood ties, especially in matriarchal society, “everyone knows his mother but not his father. (it’s a paradise for women) in the tribe, a man takes up the responsibility of breeding horses and sows everywhere. The woman under her body may be her half sister or aunt, or her daughter. Incest has existed since ancient times. In this age of carnal desire, sexual love between men and women is mostly in pursuit of happiness, rather than in order to reproduce the next generation. Apart from morality and ethics, how should we face incest?