Condoms are divided into sizes and standard sizes.

By the diameter of the opening part of the size can be divided into four types of models, large, medium, small, extra small, etc. The diameter of the opening part of the large condom is 54 + 2 mm, equivalent to a diameter of 35 mm, the diameter of the opening part of the medium-sized condom is 52 + 2 mm, equivalent to a diameter of 33 mm, the diameter of the opening part of the small condom 50 + 2 mm, equivalent to a diameter of 31 mm, the diameter of the opening part of the extra small condom 48 + 2 mm, equivalent to a diameter of 29 mm. The diameter of the opening part of the extra small condom is 48+2mm, which corresponds to a diameter of 29mm.

Domestic condoms are labeled by breadth. The width is the width of the condom when it is flattened, which is one-half of the circumference. The range of width from 49mm to 56mm is basically commercially available, with 52mm being the most common, and is generally referred to as medium.

Condom use precautions:

The specific use of condoms, including the use of condoms should be thoroughly checked before the use of the condom leakage, and the small capsule of air emptying, you can make the condom rupture the risk of minimizing the degree.

At the same time in the coitus should have an extra insurance policy, prepare a good thing after the emergency contraceptive pill. Once the condom breaks, you can reverse the embarrassing situation in time.

The prototype of the condom can be traced back as far as 3,000 years ago to ancient Egypt, but at that time, condoms did not have the function of contraception, but were used by men as a kind of ornament to symbolize status.

The modern condom appeared in 17th-century England, where King Charles II's physician, Dr. Condom, was inspired by the expanding swim bladder of a fish to create a condom that could be attached to the penis to prevent pregnancy, which explains why it is called a "condom" in English. By the end of the 19th century, condoms took a new leap forward with the advent of natural latex.

Reference: Baidu Encyclopedia - Condom