All other values are those given in the review. Appearance and consistency Human semen in a petri dish Semen is typically translucent with white, grey or even yellowish tint. Blood in the semen can cause a pink or reddish colour, known as hematospermia , and may indicate a medical problem which should be evaluated by a doctor if the symptom persists. Semen quality Semen quality is a measure of the ability of semen to accomplish fertilization.
Thus, it is a measure of fertility in a man. It is the sperm in the semen that is the fertile component, and therefore semen quality involves both sperm quantity and sperm quality. Quantity The volume of semen ejaculate varies but is generally about 1 teaspoonful or less. A review of 30 studies concluded that the average was around 3. Like other supplements, including so-called herbal viagra , these are not approved or regulated by the Food and Drug Administration as licensed medications would be , and none of the claims have been scientifically verified.
Similar claims are made about traditional aphrodisiac foods, with an equal lack of verification. Storage Semen can be stored in diluents such as the Illini Variable Temperature IVT diluent, which have been reported to be able to preserve high fertility of semen for over seven days. For human sperm, the longest reported successful storage with this method is 21 years.
This includes transmission risk for sexually transmitted diseases such as human papillomavirus HPV or herpes , especially for people with bleeding gums, gingivitis or open sores. Hematospermia The presence of blood in semen or hematospermia may be undetectable it only can be seen microscopically or visible in the fluid.
Its cause could be the result of inflammation , infection , blockage, or injury of the male reproductive tract or a problem within the urethra , testicles , epididymis or prostate.
It usually clears up without treatment, or with antibiotics , but if persistent further semen analysis and other urogenital system tests might be needed to find out the cause.
Semen allergy In rare circumstances, humans can develop an allergy to semen, called human seminal plasma sensitivity. It appears as a typical localized or systemic allergic response upon contact with seminal fluid.
There is no one protein in semen responsible for the reaction. Symptoms can appear after first intercourse or after subsequent intercourse. A semen allergy can be distinguished from a latex allergy by determining if the symptoms disappear with use of a condom.
Desensitization treatments are often very successful. Such benefits include male insects transferring nutrients to females via their ejaculate; in both humans and bovines, the fluid has antiviral and antibacterial properties; and useful bacteria such as Lactobacillus have been detected in fluid transferred from birds and mammals. The ensuing orgasm and ejaculation will then finally expel the energy from the system completely. Greek philosophy In Ancient Greece , Aristotle remarked on the importance of semen: This can only be emitted by the male as only the male, by nature of his very being, has the requisite heat to concoct blood into semen.
Nourishment that would otherwise make the body grow is diverted to the production of semen. Aristotle is saying that at this stage the body is still growing; it is best for sexual activity to begin when its growth is 'no longer abundant', for when the body is more or less at full height, the transformation of nourishment into semen does not drain the body of needed material.
Retention was believed to cause female hysteria. Blood is an example of such a fluid, but semen was also widely believed to be of supernatural origin and effect and was, as a result, considered holy or sacred. The ancient Sumerians believed that semen was "a divine substance, endowed on humanity by Enki ", the god of water.
The Bible employs the term "dew" in this sense in such verses as Song of Solomon 5: There is an ancient Chinese belief that jade , in particular, was the dried semen of the celestial dragon. Based on the resemblance of dandelion juice to human semen, it was historically believed that the flower magically promoted the flow of sperm.
This belief possibly derives from the doctrine of signatures. The orchid 's twin bulbs were thought to resemble the testicles , which is the etymology of the disease orchiditis. There was an ancient Roman belief that the flower sprang from the spilled semen of copulating satyrs. In the traditions of Bali, it is considered to be the returning or refunding of the milk of the mother in an alimentary metaphor.
The wife feeds her husband who returns to her his semen, the milk of human kindness, as it were. Several tribes of Papua New Guinea , including the Sambia and the Etoro , believe that semen promotes sexual maturation among the younger men of their tribe. To them, semen possesses the manly nature of the tribal elders, and in order to pass down their authority and powers, younger men of their next generation must fellate their elders and ingest their semen.
Prepubescent and postpubescent males are required to engage in this practice. The Pistis Sophia  and Testimony of Truth  harshly condemn such practices. In the modern St. Priapus Church , consumption of semen in the presence of others is a form of worship. They can be done with one or more partners, like snowballing , felching and creampie eating , or with multiple partners, like the practices of bukkake and gokkun , which originate from Japan.
Euphemisms A huge variety of euphemisms and dysphemisms have been invented to describe semen. For a complete list of terms, see sexual slang.