Semen is a grayish-white body fluid that comes out of the gonads of male animals. It contains sperm or spermatozoa and fructose and other enzymes that help keep sperm alive for successful fertilization.

The whiteness of the white color is due to the large amount of protein in it and its slight disturbance is due to the spermatozoa present in it.


How does ejaculation occur?

Ejaculation is controlled by the central nervous system. It occurs when there is friction between the genitals and other forms of sexual stimulation. Movements are caused by stimuli that are sent to the spinal cord and brain.

Two phases of ejaculation

There are two stages of ejaculation:

Stage 1: Ejaculation in which the vas deferens (the tubes that store and transport sperm from the testicles) contract through the prostate gland toward the base of the penis and to squeeze the sperm into the urethra. The seminal vesicles release a portion of semen that is involved in ejaculation which cannot be stopped at this stage.

Stage 2: Ejaculation in which the muscles at the base of the penis and urethra contract. This causes semen to be forced out of the penis (ejaculation and orgasm) and at this stage the bladder neck also shrinks. The bladder neck shrinks to stop the back flow of semen into the urethra. Dry orgasm can occur without ejaculation from the penis. After ejaculation, the penis usually shrinks.

Semen volume and sexual pleasure

The volume of ejaculation is not related to sexual pleasure for either male or female partner. If it takes longer for the penis to release the increased amount of semen, then ejaculation and orgasm do not last long. Thus this claim is also wrong.

Semen composition

The travels through the ejaculatory ducts and mixes with the fluid in the seminal vesicles, prostate and bulbourethral glands.

The seminal vesicles produce a viscous, fructose-rich fluid that makes up about 65-70% of the sperm base.

The white color of semen is due to the secretion of prostate gland which contains enzymes, citric acid, lipids and acid phosphates. It makes up about 25-30% of the money base.It makes up about 2-5% of the sperm composition.

In addition, the bilberry glands produce clear fluid. It helps in the movement of sperm cells in the vagina and cervix. Glandular moisture contributes less than 1% to the total structure of semen.

The semen comprises of:

  • fructose
  • ascorbic acid
  • zinc
  • cholesterol
  • protein
  • calcium
  • chlorine
  • blood group antigens
  • citric acid
  • DNA
  • Magnesium
  • vitamin B12
  • phosphorus
  • sodium
  • potassium
  • uric acid
  • lactic acid
  • nitrogen
  • other nutrients

Semen per ejaculation

Ejaculation is a complex process and the last fluid of semen is found in the urethra after completion of ejaculation. The volume of semen emitted varies with each ejaculation. The average ejaculation is about 3.4 ml at a time. 

If there is a long interval between ejaculations, the number of sperm in the semen increases but there is no increase in the as a whole.