Low sperm count (Oligospermia) and fertility

Semen is a thick, white fluid, but it can vdiffer in color and consistency. 

For a man to be able to impregnate a woman, he need to produce enough quantity and quality of sperm that are able to find a way to the woman egg and fertilize it.  If this process is compromised in any way infertility will result. 

The average sperm count is 2 million sperm per millimeter of ejaculation to get a woman pregnant and any number less than this is called oligo-spermia.

Watery semen can occur due to low sperm count, lifestyle factors, and nutritional deficiencies.

The World Health Organization (WHO) define low sperm count, or oligospermia, as producing fewer than 15 million sperm per milliliter of semen.

Low sperm count can make it more difficult for a woman to conceive but does not necessarily mean that the man sterile. 

The cause of low sperm count has not been fully understood but it has been established that some genetic conditions, such as Klinefelter syndrome, can affect a person's sperm count.

Other causes of low sperm count can include:

hormone disorders, such as hyperthyroidism and hypogonadism

infections,

exposure to radiation or toxins, such as industrial chemicals, herbicides, and lead, drug use,

excessive alcohol intake,

tobacco use,

excess body weight and

certain medications.

Varicocele

A varicocele is a swelling of the veins that run from the testicles to the scrotum, it can develop in one or both testicles. This condition may not cause symptoms, but it can reduce sperm production and decrease semen quality in some people. 

.According to the Urology Care Foundation, it affect around 15% of males, and around 40% of males tested for fertility issues have this condition.

This is means, around 80% of people with a varicocele do not have any fertility issues.

Frequent ejaculation

Frequent ejaculation may lead to watery semen, this fact remains unknown to man, If a person masturbates or engages in sexual activity multiple times per day, their body may not have enough time to produce the same volume or quality of semen, this is why sex should not be a daily practice,  the body should be allowed time to make up for the lost sperm.

In a 2016 study, 20 males followed a daily ejaculation schedule for 14 days after 3–5 days of abstinence. The researchers collected and analyzed the participants' semen samples on days 1, 3, and 14 of the study.

They found that both the semen volume and the amount of available sperm decreased between days 1 and 3 and again between days 7 and 14.

Retrograde ejaculation

During ejaculation, semen passes through the urethra and out of the penis. However, a dysfunctional bladder sphincter can cause semen to travel backward into the bladder, resulting in a condition called retrograde ejaculation.

People who experience retrograde ejaculation may produce less semen or semen that appears thin or watery.

Source

WHO.