What do you mean by complementary harmony of yin and yang?

In modern China society, the concept of sex is often distorted and regarded as unclean. However, in many ancient sex books in China, many correct sexual knowledge were mentioned, which not only emphasized the importance of sex, but also believed that men and women should have fun together and pay attention to hygiene, rather than just focusing on their own speed. The description of foreplay in the book is also quite detailed, including caressing and hugging. Men can only enter sexual intercourse when women are sexually excited, which is far from everyone's attitude of talking about transsexuality. \ r \ Many Chinese sexual behaviors are animal-like gestures. For example, "the crane crosses the neck" is a posture in which a man sits in a chair, a woman sits face to face on his lap, and his hands encircle the man's neck. And "tiger mating" is the so-called "backyard posture", where women kneel on the bed and men enter from behind the women. \ r \ nIn addition, Taoism has a set of interesting sayings about men and women, that is, "Harmony of Yin and Yang", "Supplementing Yang with Yin" and "Supplementing Yin with Yang". Taoism believes that men's semen contains the essence of human body-"jing yuan" or "Yuanyang", and women will also release "true yin" when they reach orgasm. Therefore, men should "guard against women" more, but "close sperm, guard against sperm and not leak", so as to collect yin and replenish yang. On the contrary, the same is true of collecting yang to replenish yin. \ r \ However, none of these statements can be scientifically verified, because semen or vaginal fluid is only composed of ordinary substances. For example, semen is composed of sperm and semen slurry, and sperm is a germ cell in human body, and semen slurry contains carbohydrates and inorganic salts (zinc, potassium, magnesium). Can be taken from the diet.