What are some interesting phenomena in the reproductive system? What factors are closely related to sperm concentration

The completion of sexual life requires the coordination of internal and external genitalia, and the same is true of breeding new life. People's understanding of the reproductive system is mostly vulva. In fact, the reproductive system also includes many contents, and they also have interesting phenomena that most people do not know.

High voice, high sperm concentration

In a study involving several European countries, scientists found that although women think men with low voices are more masculine and attractive, their sperm concentration is lower than that of their peers with high voice.

Testicular function affects appearance

Testis is not only very important for the realization of reproductive function, but also plays a key role in the normal development of boys in puberty. Testosterone produced by the testis is responsible for the development of secondary sexual characteristics, including voice, facial features and body hair growth. In other words, the function of testicles affects the appearance of people to a certain extent.

Some animals have very strange reproductive systems

The internal system of animals is very similar to that of humans, but the reproductive system is significantly different. For example, female kangaroos have three vaginas, two transverse vaginas are used to receive sperm during mating, and the middle vaginas are used for delivery. Accordingly, male kangaroos have two toothed penises for transverse vaginal insemination. Most birds have no penis and vagina, only the genital cavity, which is a separate hole for waste and reproduction.

Infertility is more common than expected

In the medical field, if a couple fails to conceive after a year of unprotected sex, it is called infertility. According to the report published in the Journal of Fertility and Sterility in 2013, nearly 1/6 of adult couples in the United States are infertile.

Ancient Egyptians used contraception thousands of years ago

It may be considered that contraception technology is a new invention, but fertility management has been started since nearly 4000 years. The earliest written record of contraception technology comes from ancient Egypt. One method of contraception is to let women lie on the bed with sodium carbonate and put honey in the vagina.

Men have more germ cells than women

There is a significant difference in the number of germ cells produced by men and women. At birth, women have 1 million to 2 million eggs, and only about 300000 remain at the onset of puberty, of which only 300 to 400 premenopausal ovulation. Each man produces more than 500 billion sperm cells in his life, and healthy men release 1.2 million sperm cells during ejaculation.