Sex science is a comprehensive subject that studies human sexual behavior. The term sexology was first used by the German medical scientist I Bloch in 1960. The original text in German is SEXUAL WISSENSCHAFT, which contains more contents.

Sex has rich connotations. It is not only the source of human life, but also an indispensable part of the whole life. Biologically speaking, sex is first and foremost a natural and physiological phenomenon. Some people interpret sexual behavior as an "instinct" of human beings from a biological point of view. The so-called instinct is inherited by animals and has complex unconditional reflex activities to ensure the survival of individuals and races. Because most creatures' sexual behavior is closely related to reproduction, especially the mating of animals has a very complicated biological regulation effect on the continuation of their race, some people interpret sexual behavior as the need of reproduction, and even regard fertility as the sole purpose of sexual behavior. But it is obviously not enough to regard fertility as the sole purpose of sex. Lower animals don't know that their mating will lead to reproduction, and a large number of human sexual activities are not only for fertility, especially after people consciously control population growth and implement family planning, the non-fertility purpose of sexual activities becomes more obvious. For human beings, the greater driving force for participating in sexual activities is to obtain physical happiness and spiritual satisfaction. The differentiation of the two sexes leads to mutual attraction, which leads to the impulse of love and combination. Therefore, sex is not only the bond connecting life, but also the adhesive of love and the source of joy. Normal sexual behavior can improve physical and mental health.

People have both biological and social attributes. Sociologically speaking, human nature is not only the existing state of life entity, but also endowed with spiritual and cultural significance, which is the basic element of life health and happiness. The differences between men and women are not only manifested in anatomy and physiology, but also in psychology and society. The combination of the two sexes is not only a physiological need, but also a need to form a certain social relationship, form a family, engage in production and jointly raise children, so that human society can continue and develop. As an instinct, sex always seems to be a personal matter, so in addition, it involves other people and can directly affect society. Love, marriage, family, fertility and population are all directly related to sex. Sexual health, reproductive health and sexually transmitted diseases are related to personal health, social health and social development. Human sexuality has been branded with human society from the very beginning. At every stage of life, the meaning and manifestations of sex are different. For children, sex is a game; For teenagers, sex is a strong desire; For adults, sex can be used to reproduce, express love and become a source of happiness. Human sexual behavior is not only a form of sexual intercourse between men and women, but also the pattern of sexual behavior is not only determined by sexual organs, and gender and body structure are not necessarily the same. Human beings have extremely complicated brain activities such as thinking, memory and reasoning, which can produce different psychological reactions to things and form different personalities and mental states, all of which will have an impact on sex, and more importantly, sex may in turn affect these aspects. People are influenced by extremely complicated social factors, such as ethics, religion, culture, art, politics, law, historical traditions, national habits, social status and so on. Therefore, there are not only different understandings about sex, but even completely opposite views, which have formed a series of complex social problems. And knowledge will change with the times under the comprehensive effect of various social factors. Therefore, sex is by no means a simple physiological phenomenon, but a social and cultural phenomenon based on physiology.

Cultural anthropology increases the influence and cognition of cultural patterns on sexual behavior patterns, which tells people that they can't take an absolute attitude when judging sexual behavior patterns. The concepts of good and bad, normal and abnormal have only relative meanings. Because sex involves a wide range of fields and there are shortcomings in research and understanding, with the progress of science and technology, new ideas and methods will be put forward continuously, so as to gradually have a deeper understanding.