Both the coagulation and liquefaction of semen are the result of chemical reactions between the different components of the fluid, for which the seminal vesicles and prostate are chiefly responsible in respective order. The density and viscosity of semen when liquefied may be compared to that of refrigerated milk of varying fat content or room temperature half-and-half. The pH of semen is commonly measured between 7. Semen also has a high buffering capacity; it is capable of rendering the environment of the vagina which is normally slightly acidic neutral shortly after ejaculation. Semen is mostly water, but it also contains amino acids and protein, sugars, minerals, and in fertile men sperm cells!
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Sperm content of pre-ejaculatory fluid
Why Are Million Sperm Cells Released During Sex? | Live Science
The purpose of withdrawal is to prevent contact between egg and sperm and reduce the possibility of pregnancy. During sex, the penis releases two kinds of fluids. The first is pre-ejaculate or pre-cum, a lubricant made in a gland in the penis. This fluid usually contains no sperm, but can transmit infections. The second, released with ejaculation, is semen, which is made in the testicles and carries thousands of sperm in addition to any sexually transmittable infections that may be present. Because previous ejaculations can leave some sperm behind in the folds of the penis, it is important for the man to urinate and wipe the tip of his penis to flush out leftover sperm from the urethra, the tube from which both urine and semen exit the penis.
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The first fraction of ejaculate is the most effective for conception
Every sperm is great. In fact, the average male will produce roughly billion sperm cells over a lifetime and shed at least one billion of them per month. A healthy adult male can release between 40 million and 1. In contrast, women are born with an average 2 million egg follicles, the reproductive structures that give rise to eggs. By puberty, a majority of those follicles close up and only about will ever release mature eggs for fertilization.
Sperm in the first fraction of ejaculate are more numerous, move more and present better quality DNA than those lagging behind. This is the conclusion of a study led by the Ginemed fertility clinic, which confirms that while the objective of the first fraction is to fertilize the egg, the second phase is so that no sperm from any other male has a chance to fertilize it. A study led by the Ginemed Assisted Human Reproduction Clinic analyses the advantages of using fractions of ejaculate separately in in-vitro fertilization as a way to improve the sample of the semen. The researchers' hypothesis was that, comparing the different fractions of semen in an ejaculation, the first would contain sperm with better seminal parameters and could be used as an effective method for selecting sperm prior to fertilization. The first objective of ejaculate would be to fertilize the egg and the second so that no other male has the opportunity to fertilize it.