Infertility after marriage, what is the reason why men cannot have children?

I believe that all men know this truth: no matter how rich their life is or how successful their career is, they need an heir to carry on their legacy. If they don’t have children, all their efforts will eventually become “in vain” when they are old. However, why do some men in modern society lose their fertility?

Testicles:

The sperm factory can cause infertility if the testicles are underdeveloped and there are other acquired diseases.

Seminal vesicle, vas deferens:

The seminal vesicles and vas deferens are important organs for transporting and storing sperm. Inflammation, adhesion, blockage, etc. may lead to infertility.

semen:

Oligospermia, azoospermia, necrospermia, low sperm survival rate, poor motility, sperm deformity, poor semen liquefaction, etc. are the main causes of male infertility.

Urethra:

Pathogens such as urethritis or bacterial or viral infections can directly or indirectly affect sperm quality and cause infertility.

Epididymis:

It is the place that connects the vas deferens and testicles and stores mature sperm. Invasion by pathogenic microorganisms, inflammatory reactions or other diseases can lead to infertility.

prostate:

Prostatic fluid accounts for 30% of semen. The prostate is an important part that provides nutrients to sperm. Inflammation and infection can cause problems such as low sperm survival rate, poor motility, low sperm count, dead sperm, and poor liquefaction, leading to infertility.

Ejaculatory dysfunction:

Common ejaculation dysfunctions such as anejaculation and retrograde ejaculation prevent semen from being ejected from the urethra, leading to infertility.

Sexual dysfunction:

Male sexual dysfunction such as impotence and premature ejaculation prevents sperm from entering the female vagina normally, resulting in inability to conceive.