Sexual behavior is a natural and instinctive behavior of people, and it is also a social behavior. Its social nature is reflected in the fact that it is bound by certain social moral norms and dominated by certain ideological concepts. A strong reproductive purpose will fully display the reproductive function of sexual intercourse, resulting in numerous births; a strong pleasure and love purpose will inhibit the display of reproductive functions, resulting in rare births. Therefore, generally speaking, sexual concepts affect women's fertility levels and the birth rate. In fact, with the improvement of economic, cultural and scientific levels, people's sexual concepts have changed significantly, and women's fertility levels have been significantly reduced. There is a concept that is not very eye-catching in demography, called total natural fertility, represented by TF, which refers to the fertility of women during their childbearing years without any inhibitory factors. There are certain differences in TF due to different races and regions. Generally, a woman's fertility index is 17. The childbearing period of each woman is generally 30 years. Excluding the 17% infertile period, the average birth interval of each child is 17.5 months. The actual fertility level of women is much lower than this, and there is a role of concept here. At the beginning of the twentieth century, the birth rate in some European countries dropped significantly. Some statistics show that in 17 countries over the past 20 years, the rate of decline was as low as 10.4% in Romania, 46% in Germany, and 50% in France, with an average reduction of more than 30%. In the 1930s, someone analyzed the reasons for the decline in the birth rate in the article "Population Issues and Childbirth Restrictions" (Lin Lixing) and pointed out: "Their citizens are all centered on seeking their own happiness and happiness, and they regard sex as an issue. The behavior of cultivating one's own entertainment, not paying attention to reproductive functions, and even trying to avoid pregnancy and childbirth is one of the reasons for low productivity." (Lin Lixing: "Population Issues and Childbirth Restrictions", "Beiping Morning News" "Population Supplement" Issue 4, 1932 July 3). It can be seen that the widespread existence of the concept of sexual pleasure is an important reason for the reduction of women's fertility level. China has a strong family concept and the idea of ​​"more children means more blessings". The union of the two sexes is simply regarded as a means of "carrying on the family line". It is believed that the highest value of women is to give birth to children. This old sexual concept brings two results, one is more births, and the other is the concept of sexual enjoyment is diluted, which reduces people's sexual value. With the improvement of our country's economic and cultural level, people's concepts are gradually changing. Especially in economically developed areas and among people with higher cultural levels, the number of people who have sexual intercourse for the purpose of procreating offspring has been greatly reduced. According to the materials released in the "Survey Report on Twenty Thousand Cases of "Sexual Civilization" in China", the most affirmative answers among college students to the purpose of sexual intercourse were: seeking sensual pleasure (21.3%), developing love (54.7%), and organizing 6.5% were for family, 2.9% were for having offspring, 3.9% were for eliminating loneliness, 1.5% were for satisfying the other party's requirements, and 9.1% were unanswered or unknown. It can be seen that there are very few college students who have sexual intercourse for the purpose of procreating offspring. This situation is related to the demographic statistics that the higher the education level of women, the lower the fertility index and the higher the birth control rate. It just shows that different sexual concepts lead to different birth levels of the population, and changes in sexual concepts are conducive to birth control. The same survey shows that rural couples believe that sexual intercourse is necessary for the purpose of having children, which is four times higher than that of urban couples. Linking the fertility levels of urban and rural women also illustrates the dominance of sexual concepts on population fertility. Of course, sexual concepts do not exist in isolation. They are the product of a certain level of productivity and economic conditions. However, as a cultural form, sexual concepts have a relatively independent side, and they may change through enlightenment and guidance. It is necessary to admit that the pursuit of love and sexual enjoyment is a natural need of human beings, and realizing one's own sexual value is a normal psychology and requirement. Moreover, what we are talking about is sexual enjoyment that conforms to socialist moral norms. This pursuit will stimulate people's demand for contraception, enhance people's motivation for self-control in reproduction, and promote the reduction of population birth levels. The desire to have more children is harmoniously linked to conservative sexual concepts and sexual ignorance. They are two sides of the same problem. Strengthening the sexual concept of pursuing enjoyment and developing love will dilute the fertility concept of marrying a wife, having children, and reproducing children. Family planning propaganda, while denying the concept of "more children, more blessings", and appropriately combining propaganda with changing sexual concepts will help the masses accept family planning. 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