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It has to do with what the man/boy finds arousing, but sometimes an erection can happen spontaneously for a reason I cannot fathom (possibly a change in heart rate or some other circulatory issue). It is also a good way to experiment finding out what arouses a person.

The smooth muscles in the arterial walls relax when nitric oxide is released, at which time the vessels dilate, blood flow increases, the vascular channels become engorged with blood, and erection of the penis occurs.

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Q: What physiological process underlies erection of the penis?
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What is an eraction?

It seems like you are referring to a misspelling of the word "erection," which is a physiological response where the penis becomes engorged with blood and becomes firm. Erections can occur due to sexual arousal or other physiological factors.


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When you have an erection :).


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He got an erection. May be true or just an expression of his feelings.


How do you use this gel on penis?

Before performing sexual intercourse, put the gel around your penis for prolong erection. Some ointment or gel descibe to the label for how many minutes to start the full penis erection. Hard and full erection can give sex satisfaction to a woman.


How does erection occur?

An erection occurs when the male penis is filled with blood. Also the muscles harden in the penis to make it hard with help of muscle linked to the anus. That's why a guy clenches up when he releases semen. Usually this process starts when the male thinks of something or sees or feels something that turns him on (gets him sexually aroused). That then causes the penis to fill up with blood, and harden, therefore creating an erection. Younger males sometimes just have erection 24/7 for no reason at all but apparently puberty.


When the penis becomes engorged with blood and hard?

erection


What does it mean when a guy says he had a erection?

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Prolonged erection is an abnormal phenomenon with regard to penis health. This is caused by taking drugs like viagra for this purpose. Male without confidence in their capacity for erection, tends to take pills before sexual encountrol to prolong erection. Natural penis erection is the best method when dealing happy sex life.


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it is 2 inches with an erection


How do you get penis hard?

To get an erection you need to either be aroused or masturbate, it may take a minute or two but that is the fastest way to an erected penis