PENILE EXERCISING ACRONYMS
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The topic is no longer avoided as people have realized there is nothing shameful in using this device. Penis pumps are not only used by men who want to make their penis bigger or treat conditions like Peyronies Disease, but also by anyone looking to spice things up in the bedroom. A penis pump is a device consisting of a cylinder that is placed over the penis and a pump to create vacuum in the device.
Water based pumps like Penomet and Bathmate don't have a separate pump, water is removed from the cylinder by pressing down the device. The more pressure is created in the cylinder the more blood flows in the vessels in the penis making it gain in size. The first penis pump was created in the 's, but it's use became widespread only in the 's. Ever since then, penis pumps are pretty common.
Men use it to enhance their penis size as well as their performance in bed, some even include it in the foreplay. You can even make your own penis pump or get a professionally manfuctured one. Penis pumps are recognized by doctors and health specialists all over the world. They recommend this device to their patients with Penile Dysfunction and Peyronies Disease as well as with other sexual performance and erection related problems. Using a pump regularly also has other benefits. It can make the penis longer and thicker giving it more volume overall, straighten the curvature, give better, long lasting erections and better control over ejaculation.
In cultures where more than a minimum of clothing is worn, the penis allows the male to urinate while standing without removing much of the clothing. It is customary for some men to urinate in seated or crouched positions.
The preferred position may be influenced by cultural or religious beliefs. A meta-analysis  summarizing the evidence found no superior position for young, healthy males. For elderly males with LUTS however, in the sitting position compared to the standing:. This urodynamic profile is related to a lower risk of urologic complications, such as cystitis and bladder stones. An erection is the stiffening and rising of the penis, which occurs during sexual arousal , though it can also happen in non-sexual situations.
Spontaneous erections frequently occur during adolescence due to friction with clothing, a full bladder or large intestine, hormone fluctuations, nervousness, and undressing in a nonsexual situation. It is also normal for erections to occur during sleep and upon waking. See nocturnal penile tumescence. The primary physiological mechanism that brings about erection is the autonomic dilation of arteries supplying blood to the penis, which allows more blood to fill the three spongy erectile tissue chambers in the penis, causing it to lengthen and stiffen.
The now-engorged erectile tissue presses against and constricts the veins that carry blood away from the penis. More blood enters than leaves the penis until an equilibrium is reached where an equal volume of blood flows into the dilated arteries and out of the constricted veins; a constant erectile size is achieved at this equilibrium.
The scrotum will usually tighten during erection. Erection facilitates sexual intercourse though it is not essential for various other sexual activities.
Although many erect penises point upwards see illustration , it is common and normal for the erect penis to point nearly vertically upwards or nearly vertically downwards or even horizontally straight forward, all depending on the tension of the suspensory ligament that holds it in position. The following table shows how common various erection angles are for a standing male, out of a sample of 1, males aged 20 through In the table, zero degrees is pointing straight up against the abdomen, 90 degrees is horizontal and pointing straight forward, while degrees would be pointing straight down to the feet.
An upward pointing angle is most common. Ejaculation is the ejecting of semen from the penis, and is usually accompanied by orgasm. A series of muscular contractions delivers semen, containing male gametes known as sperm cells or spermatozoa , from the penis. It is usually the result of sexual stimulation , which may include prostate stimulation.
Rarely, it is due to prostatic disease. Ejaculation may occur spontaneously during sleep known as a nocturnal emission or wet dream. Anejaculation is the condition of being unable to ejaculate. Ejaculation has two phases: The emission phase of the ejaculatory reflex is under control of the sympathetic nervous system , while the ejaculatory phase is under control of a spinal reflex at the level of the spinal nerves S2—4 via the pudendal nerve.
A refractory period succeeds the ejaculation, and sexual stimulation precedes it. The human penis has been argued to have several evolutionary adaptations. The purpose of these adaptations is to maximise reproductive success and minimise sperm competition. Sperm competition is where the sperm of two males simultaneously resides within the reproductive tract of a female and they compete to fertilise the egg.
This is the process whereby males unwittingly invest their resources into offspring of another male and, evolutionarily speaking, should be avoided at all costs . The most researched human penis adaptations are testis and penis size , ejaculate adjustment and semen displacement. Evolution has caused sexually selected adaptations to occur in penis and testis size in order to maximise reproductive success and minimise sperm competition.
Sperm competition has caused the human penis to evolve in length and size for sperm retention and displacement. Another reason for this adaptation is due to the nature of the human posture, gravity creates vulnerability for semen loss. Therefore, a long penis, which places the ejaculate deep in the vaginal tract, could reduce the loss of semen.
Another evolutionary theory of penis size is female mate choice and its associations with social judgements in modern-day society.
These varied in height, body shape and flaccid penis size, with these aspects being examples of masculinity. This is reflected in the association between believed sexual prowess and male penis size and the social judgement of penis size in relation to 'manhood'. Like the penis, sperm competition has caused the human testicles to evolve in size through sexual selection.
The human testicles are moderately sized when compared to other animals such as gorillas and chimpanzees, placing somewhere midway. Research has also demonstrated that evolutionary adaptations of testis size are dependent on the breeding system in which the species resides. Human males live largely in monogamous societies like gorillas, and therefore testis size is smaller in comparison to primates in multi-male breeding systems, such as chimpanzees.
The reason for the differentiation in testis size is that in order to succeed reproductively in a multi-male breeding system, males must possess the ability to produce several fully fertilising ejaculations one after another. One of the primary ways in which a male's ejaculate has evolved to overcome sperm competition is through the speed at which it travels. Ejaculates can travel up to centimetres at a time which, when combined with its placement at the highest point of the vaginal tract, acts to increase a male's chances that an egg will be fertilised by his sperm as opposed to a potential rival male's sperm , thus maximising his paternal certainty.
In addition, males can—and do—adjust their ejaculates in response to sperm competition and according to the likely cost-benefits of mating with a particular female. The number of sperm in any given ejaculate varies from one ejaculate to another. A male will alter the number of sperm he inseminates into a female according to his perceived level of sperm competition,  inseminating a higher number of sperm if he suspects a greater level of competition from other males.
In support of ejaculate adjustment, research has shown that a male typically increases the amount he inseminates sperm into his partner after they have been separated for a period of time. Increasing the number of sperm a male inseminates into a female acts to get rid of any rival male's sperm that may be stored within the female, as a result of her potential extra-pair copulations EPCs during this separation. Through increasing the amount he inseminates his partner following separation, a male increases his chances of paternal certainty.
This increase in the number of sperm a male produces in response to sperm competition is not observed for masturbatory ejaculates. Males also adjust their ejaculates in response to sperm competition in terms of quality. Research has demonstrated, for example, that simply viewing a sexually explicit image of a female and two males i.
A female's phenotypic quality is a key determinant of a male's ejaculate investment. Increasing investment in females with high quality phenotypic traits therefore acts to offset the ejaculate investment of others. Through assessing a female's phenotypic quality, males can judge whether or not to invest or invest more in a particular female, which will influence their subsequent ejaculate adjustment.
The shape of the human penis is thought to have evolved as a result of sperm competition. This means that in the event of a rival male's sperm residing within the reproductive tract of a female, the human penis is able to displace the rival sperm, replacing it with his own.
Semen displacement has two main benefits for a male. Firstly, by displacing a rival male's sperm , the risk of the rival sperm fertilising the egg is reduced, thus minimising the risk of sperm competition. However, males have to ensure they do not displace their own sperm. It is thought that the relatively quick loss of erection after ejaculation, penile hypersensitivity following ejaculation, and the shallower, slower thrusting of the male after ejaculation, prevents this from occurring. The coronal ridge is the part of the human penis thought to have evolved to allow for semen displacement.
Research has studied how much semen is displaced by different shaped, artificial genitals. It does this by forcing the semen under the frenulum of the coronal ridge, causing it to collect behind the coronal ridge shaft.
The presence of a coronal ridge alone, however, is not sufficient for effective semen displacement. It must be combined with adequate thrusting to be successful. It has been shown that the deeper the thrusting, the larger the semen displacement. No semen displacement occurs with shallow thrusting. The behaviours associated with semen displacement, namely thrusting number of thrusts and depth of thrusts , and duration of sexual intercourse ,  have been shown to vary according to whether a male perceives the risk of partner infidelity to be high or not.
Males and females report greater semen displacement behaviours following allegations of infidelity. In particular, following allegations of infidelity, males and females report deeper and quicker thrusting during sexual intercourse. Circumcision has been suggested to affect semen displacement.