1823, from Holland to Nagasaki, siebert, who worked as a doctor in a commercial museum for six years, went to Edo to meet the shogunate. When he saw naked clients freely entering and leaving brothels in the suburbs of Edo, he was speechless. In his book A Journey to Edo House, he pointed out that brothels, like restaurants, are necessities of daily life in Japan, and foreigners have been shocked by the sexual openness of the Japanese since ancient times, just like publicly entering and leaving brothels and cafes during the day. Dong Jiliantian, a professor of religious studies at Musashiqiu Short-term University, pointed out that Christianity often equates "sex" with "sin", but Japanese myths such as Historical Records do not have this consciousness. At every key point in Japanese mythology, "female yin" is bound to be performed. In fact, according to myth, even the country "Japan" itself is the product of sexual intercourse between goddess and goddess. A famous story is that the god in the sky closed the skylight and the world fell into darkness. The gods held a dance in front of the skylight. A goddess bared her breasts and danced wildly, which attracted the audience to laugh and reached its peak. God in the sky couldn't help looking out, and the skylight was reopened. Emperor Jimmu, the first Japanese emperor in the myth, married a Dallara queen named Nuyin. The "Yin Yin" Queen's parents are also enthusiastic people. It is said that when her father saw her mother, he turned into an arrow and shot into the other person's shadow. The other party was pregnant and gave birth to this "Yin Yin". In the early Meiji period (about 130 years ago), British scholar Chamberlain went to Japan to study abroad, intending to translate the Japanese myth "Ancient Stories" into English and publish it. As a result, the translation was mistaken for pornographic novels, leaving an interesting story. Professor Tian Feng Chuan pointed out that Japanese mythology regards the vulva as a signpost to open the gods, and the Japanese worship nature, and at the same time regard "sex" as a part of nature and worship it. Both Christianity in Europe and America and Confucianism in China worship virgins and chastity, but there is no such tradition in Japan. Until16th century, women were not considered chaste before marriage. 1563 Louis Flores, a Jesuit missionary who was sent to a remote area of Japan and stayed in Japan for 34 years, wrote a book in 1585, pointing out that Japanese women can still get married without paying attention to chastity. Until the early Showa (about 70 years ago), the situation remained the same.

Kaisuke Akamatsu, an 85-year-old folklorist, spent ten years studying rural sex culture in Hyogo, Osaka, Kyoto and other places when he was young, and he wrote books such as Village Societies and Sex Rules and Folk Customs at Night, in which "night" means "men go to women's houses at night and have fun with sex". According to Keisuke Akamatsu's research, when men and women in rural Japan reached the age of 12 or 13, they began to have sexual intercourse under the guidance of their predecessors, then exchanged partners and even "killed the whole family"; Marriage is just a form. After marriage, men and women still stay here at night with others. "Stay here at night" is a normal social life and there is nothing to be ashamed of. Women in this culture usually become mothers in their teens and have about ten children in their lifetime. Keisuke Akamatsu pointed out that for people at that time, giving birth was to increase the working population, which means that sexual intercourse is beneficial to the development of the village, and it can also entertain others and themselves, and the villagers are also willing to do it diligently. Influenced by Confucianism and Buddhism, some people in the village advocate and practice abstinence, but only a weak minority. Kaisuke Akamatsu also investigated the business district of Osaka at that time and found that "the night here" was still popular. The old joke "Mouth into the House" (Japanese stand-up comedy) describes the scene where the shopkeeper and the boss sneak into the bedroom of the salesgirl at the same time in the middle of the night, making a chicken fly and a dog jump.

After World War II, farmers went out of the countryside and became workers. In addition, the clerk no longer lives in the enterprise, so the "night time" has decreased. American prefect Berry, who led the fleet to forcibly open the door to Japan, wrote Berry's Expedition to Japan, criticizing that "the lower classes in Japan are undoubtedly very lewd." When the Meiji Restoration Government advocated total westernization, men and women were forbidden to take baths together, which was contrary to the people. At that time, a medical professor at the University of Tokyo firmly believed that masturbation hindered the development of intelligence and physical quality, which led Mori Yoshiro, a novelist and Minister of Army Medical Department, to publish "The Harmless Theory of Masturbation" and launched a debate. The Japanese introduced western ideas in the mid-Kloc-0/9th century, when European and American societies regarded "sex" as a poisonous snake and beast. Norton, an American doctor, published a contraceptive manual in 1832 and was accused of obstructing morality. He was imprisoned for three months. 1857, Britain promulgated the Lord Ember Act, which authorized judges to destroy publications that "may lead to corruption". In fact, in 1920, there were still 20 states in the United States with provisions on adultery, and contraceptive knowledge was not made public in 50 states until 1965. Gao Weilishu, a professor of religious studies at Hosei University, pointed out that Christian orthodoxy regards sexual desire as a kind of evil and believes that all mankind bears the original sin because they are the product of sexual intercourse. For example, Jesus himself supported disadvantaged women and even sympathized with prostitutes. Chapter 7 of 1 Corinthians says: "It is advisable for men not to be close to women, but in order to avoid fornication, men should have wives and women should have husbands. It seems that marriage is to avoid adultery. Chapter 11 of 1 Corinthians also says, "Christ is the head of all things, and men are the head of women." This statement shows the intersection between asceticism and discrimination against women.