There are different grades of refined gas. Anyone who keeps fit for a long time can get married, and the number of sexual intercourse is controlled according to age and biological clock. At the age of 24, 36, 48, and 60, each node is postponed and the sexual intercourse interval is increased by one week. Sexual intercourse is forbidden after the age of 60. If you have given birth to a child and want to practice professionally, you can choose abstinence.