My penis becomes erect

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An erection clinically: penile erection or penile tumescence is a physiological phenomenon in which the penis becomes firm, engorged, and enlarged. Penile erection is the result of a complex interaction of psychological, neural, vascular, and endocrine factors, and is often associated with sexual arousal or sexual attraction , although erections can also be spontaneous. The shape, angle, and direction of an erection varies considerably in humans. Physiologically, erection is triggered by the parasympathetic division of the autonomic nervous system , causing the levels of nitric oxide a vasodilator to rise in the trabecular arteries and smooth muscle of the penis. The arteries dilate causing the corpora cavernosa of the penis and to a lesser extent the corpus spongiosum to fill with blood ; simultaneously the ischiocavernosus and bulbospongiosus muscles compress the veins of the corpora cavernosa restricting the egress and circulation of this blood.

When you want it to stay hard during sexual activity, it goes soft. Then, when you finally manage to sustain an erection, you end up ejaculating too quickly. It also tends to show up in a big way at inopportune times , like in the middle of your important presentation for work.

Painful erections, also known as priapism, is generally not normal and individuals with this condition must pay attention to the duration of the erection. There are many causes of erection pain, most of them include problems with blood flow and circulation of blood to the penis. Other causes may arise from medication side effects, trauma to the penis, or urethritis. Read below for more information on causes and treatments for painful erections.