“We don’t need to shy away from any conversation about sex at all; “sex” is never a scourge, and any healthy and positive aspect is worth discussing.” Mating, in the broadest sense, refers to the act of fusing reproductive cells (sperm and egg) in the body of an animal that has been fertilized in vivo through the union of sexual organs. Sexual intercourse, on the other hand, mostly refers to the process of union and internal friction between the penis and vagina in the erect state of the human opposite sex. But in recent years, the scope of sexual intercourse is also expanding, same-sex or heterosexual anal sex, oral sex, finger sex, etc., are regarded as different forms of sexual intercourse, the purpose of sexual intercourse also from simple reproduction and reproduction, expanded to pleasure, strengthen the emotional ties and other aspects. 1, penis-vaginal intercourse This is the traditional form of sexual intercourse, but also the most common form of sexual intercourse, also known as “room”, “sex”. In the process of sexual intercourse, the male erect penis enters the female vagina, rubbing and stimulating each other’s sexual organs, thus gaining sexual satisfaction. There are many different positions of penile-vaginal intercourse, including but not limited to male-on-female, female-on-male, anterior, posterior and lateral positions. It usually ends after the male orgasm ejaculation, while the female may or may not have an orgasm. 2, anal sex Anal sex is also one of the sexual intercourse, that is, the male erect penis into the male or female anus, the anus, rectum and other parts of the stimulation to obtain sexual satisfaction process. But from a health perspective, the risk of this type of intercourse is higher than other forms of intercourse, the need for adequate lubrication and complete security measures to better protect themselves and others. 3, oral sex oral sex refers to the male erect penis into the mouth and throat and lick and suck it, or the female vulva with the mouth and tongue to lick and stimulate the sexual intercourse. 4, finger sex Finger sex refers to the sexual organs (penis, vagina, clitoris) or anus of the sexual partner with finger stimulation, so that the other sexually aroused way of sex. Finger sex can exist alone as a one-time life, but also as a penis-vaginal sex foreplay exists. Sexual intercourse has positive effects such as boosting immunity, strengthening emotional bonds and trust, and reducing stress, but unsafe intercourse also occurs with risks and hazards such as the transmission of sexually transmitted infections and unwanted pregnancies. Therefore, want a high-quality sex life, these points of caution to keep in mind. 1, sexual intercourse must occur after physical and psychological maturity, and should be based on responsibility for others and themselves; 2, before sexual intercourse to fully learn about sex, learn to use condoms professionally and safely, to ensure that each other safe, healthy, not injured; 3, to respect sexual partners, know how to protect each other’s privacy; 4, once the occurrence of severe pain, more than bleeding, sexual disease infections, unwanted pregnancy and other abnormal conditions 4, in the event of severe pain, bleeding, sexual disease infection, unwanted pregnancy and other abnormal conditions, do not avoid treatment, early medical examination and treatment is the right choice. References: [1] Chung W S, Lim S M, Yoo J H, et al. Gender difference in brain activation to audio-visual sexual stimulation; do women and men experience the same level of arousal in response to the same video clip?[J]. International journal of impotence research, 2013,25(4):138-142. [2] Shi Chengli. About orgasm[J]. Chinese sex science,2003,12(2):17-20.