A number of diagnostic and treatment tests have been done on the external environment on sperm condition, and the test results invariably show that high temperature and extrusion have a large negative impact on sperm quantity and sperm quality in many aspects. Generally speaking, the human testes need to produce sperm at a temperature of 35.5 to 36 degrees Celsius. If the scrotum remains hot due to poor ventilation and excessive squeezing of the underwear, diseases such as oligospermia or spermia may occur. The teenagers who are in the important stage of sexual function and fertility development wear tight-fitting clothes for a long time in order to be fashionable. The actual fact is that you can’t get a good understanding of your own body changes, in order not to show “ugly” in front of people, deliberately restrain the rapid growth of the penis and erection when the “sharp”, specifically wear very small, contraction force underwear, the buttocks and thighs taut, so This will make the scrotum also cling to the nearby skin, preventing the distribution of heat, blood supply is blocked, will certainly affect the normal development of the testicles, making sperm vitality decline. There is even a male contraceptive pants, its shape and ordinary triangle shorts, with a certain elasticity and tension of the fabric sewn from, and nailed on a sponge testicular support. When worn, the testicles can be pressed against the skin of the vulva and inner thighs, and after 7 to 8 weeks, the sperm count in the semen can drop to zero, with an effective contraceptive period of 70 days or more. This contraceptive method was invented by experts precisely on the basis of the above findings.