Naturally, sperm is produced in the testicle and goes out of the body during ejaculation. If there is a disorder in the following cases, the chance of fertilization is reduced.
Factors that affect the number, shape, maturity and motility of sperm are:
Some factors, such as closure of the sperm outflow tubes (epididymis), cause infertility in men. The closure of the sperm outflow tubes can be due to congenital, genetic defects, infections, or genitourinary inflammation. Of course, prior surgery can also close those tubes. Among other factors, infertility in men is varicocele. In this case, the veins in the testis are dilated and the quality of the sperm decreases.
Other factors, such as sexual inability or early ejaculation can also be the cause of infertility in men.