Fertility depends upon various factors in your body. To be fertile, you must have the following characteristics:
The proper functioning of at least one testis is crucial for sperm production and testosterone secretion.
Testosterone is the most significant androgen but follicular stimulating hormone (FSH) and luteinizing hormone (LH) also play their roles. LH is a potent stimulator for testosterone production, whereas FSH supports spermatogenesis.
Semen provides energy to sperm and facilitates its transport to the vagina. For this purpose, your body needs functioning accessory glands that secrete semen.
Besides, the transport of semen to the urethra needs correct tubular anatomy. The male urethra also transports urine from the bladder. In some cases, due to the poor patency of tubes, semen goes into the bladder instead of getting ejaculated. Therefore, any condition that disturbs tubular anatomy indirectly causes male infertility.
The production of sperm alone is not enough. Your semen must have motile, structurally healthy, and enough volume of sperm to cause a pregnancy. If the sperm count is low, sperm motility is unproductive, or abnormal sperm are higher in number, fertilization becomes difficult.