Critical Sexual Activity边缘性性行为
Regularity of sexual activity性生活频率
vaginal bleeding during sexual activity交接出血
The text emphasizes the necessity of teaching sexual life techniques as contained therein. It then introduces the fundamental principle of controlling sexual desire and regulating sexual activity based on one's age.
本文介绍了《备急千金要方》中谈及传授房中术的必要性，然后介绍了性生活节欲的根本原则和传授房中术的年龄。
参考来源 - 《备急千金要方》养生思想研究