what cause the penis to erect??
492992
This is what the American Cancer Society states:\nAn erection occurs when the brain sends a signal down the spinal cord and through the nerves that sweep down into the pelvis. Some of these important nerves run along both sides of the prostate gland. \n\nWhen this signal is received, the spongy tissue inside the shaft of the penis relaxes and the arteries (blood vessels) that carry blood into the penis expand. As the walls of these blood vessels stretch, blood races into the penis at up to 50 times its usual speed. The blood fills 2 spongy tubes of tissue inside the shaft of the penis. The veins in the penis, which normally drain blood out of the penis, squeeze shut so that more blood stays inside. This causes a great increase in blood pressure inside the penis, which produces a firm erection.
1108994
You could be losing an erection for a number of reasons.  Number one is psychological---if you don't really like the partner you're with, or if you're afraid and all you're thinking about is how well you're going to perform in his/her eyes, this can effect your sexual function.  The brain has a direct effect on the penis.  Number two, it could be your age--if you're over the age of 40, you're more likely to suffer from erectile dysfunction, which is actually quite more common than most men would like to admit.  A drug like Cialis or Viagra may be appropriate for you.  There are many more reasons, but I'm willing to bet it's number one or two...and in either case, you should speak to your doctor, who is trained to deal with situations like yours.
954013
These seem to be three separate issues.\n\nFirst, some men have a bend in their penis - this is quite natural and unless it is a severe bend or it causes you pain when you get erect, it should not be a concern. Note that some guys bend up, some left or right and others down. TYes, possibly a straight penis is the most common but I've seen some bent ones too and there is nothing wrong with them at all. However, if you experience pain in your penis when you get erect, then you should consult a doctor as the pain could indicate an underlying problem.\n\nSecond issue. Semen can come out in wild spurts or just dribble down the penis. Even in one man it can vary from one day to the next. So, as long as it comes out and is whitish in colour (although it will be clear until puberty hits you) you are fine. If you masturbate once a day or more often, try cutting down to once a week and see if that improves you range. But don;t worry if it does and don;t keep your masturbation at such a low frequency for more than a couple weeks.\n\nThe pain in your lower abdomen is probably the only item tha tmay be of concern. It could be merely from a tightening of the abdominal region during orgasm. However if it is there throughout masturbation and not just during orgasm, it might warrant a doctor's visit. I would sggest masturbating a few times while lying on your back and try to stay relaxed above and below the penis while pleasuring yoruself. Save the tensing up for the final release. If you are relaxed and the pain is there then talk to your doctor; if the pain only comes with orgasm, the, in future,  just relax and enjoy.
68433
Most healthy men wake up in the morning with an erection. The slang term for this is "morning wood." This is normal and it's fairly common. Men have several erections a night as part of their sleep cycle. Many times they wake up and find they are still erect.\n\nA man's penis becomes erect ("hard") in response to sexual arousal, excitement, and deep relaxation, such as what's experienced in deep dreaming sleep. An erection is caused by a rush of blood to the penis. A man's penis, especially a young man's penis, can also become erect without any kind of arousing stimulation — this is called a "spontaneous erection."
955864
Semi-technically speaking the penis fills with blood and becomes larger and harder by that blood being held in the penis. A penis will go flaccid and shrink once the blood is released.\n\nSo, it isn't quite nerves that cause the erection although the human body is full of sensitive nerve endings under th eskin that when massaged or caressed can offer wonderful feelings that might result in the penis becoming erect. And it doesn't have to be the nerves in the genital region receiving the attention either. Often by doign a back massage on a guy or even legs, he will display a nice hard penis.\n\nAlthough if you are always pestering or nagging a guy, you will be said to get on his nerves but that will not have the desired effect of making his penis erect. If anything it will shrink it even further - hehe.
1185138
it causes blood to fill up in the veins in the penis....people who have erection problems use them to obtain erection.\nit will not make your penis grow over time.\nit just helps the body pump blood to the area to allow hard on status\nif ya don't have a problem gettin it up, get rid of the pump
354064
because when a man gets sexually excited the blood rushes to his erection and thats what makes it erect depending on how excited he is the amount of blood that rushes down there varys more blood equals more erect or hard so the more excited he is the harder he gets
915078
There is a power drain when you get an erection.  This power drain takes a little time to build back up.  It is during these times when you see guys cutting fingers off with power tools, answering those stupid questions like "do i look fat in this", and talking incoherently when a women with nice totties and back side walks by!
318565
It sounds like your fairly young.  If that's true, then what you are describing sounds like simple genital growth.  The times when you get erections that are extremely hard and tight are times when your penis is growing.  Take a hot shower and rub some lotion in it and slowly stretch with it.  If you are older, it could be a condition known as phimosis.  IN any case, your stretching it will cure the problem.  And for the record, 4.33 is a little on the small side for the average male.  Keep stretching though and things will get bigger.
135469
i just seen a show about buried penis, and usually when a penis is buried it is caused from some extra skin around the sac, either on one side or can be on both sides.  and this can also be caused from not such a good circumcision at birth, but 85% his penis will not grow the right way and it will stay buried, the only thing you can do for this is take him to see the doctor, but right now is too early.  he may even want to do this when he gets older too.  the doctor will remove the skin that is making his penis buried and then he will add this skin up behind the penis and this will keep the penis in the correct lining.  but no need to worry if you all dont have this done, he can still get a full erection and the erection will come completely out how it is suppose too.
44203
There are many reasons why you could be getting erections.  But whatever it is it is due to some sort of stimulation.  You are a male (yes?), so this is just a natural thing that you'll have to get used to.
422189
it's physiologically impossible to pee when the penis is erect. gotta go for one or the other, buddy... :)
819581
If it's what it sounds like from you explanation you have a condition called Peyronie's Disease, which isn't overly uncommon.  It is the result of scar tissue forming inside the penis, causing it to curve or bend when erect or hard.  \n\nTypically this will eventually fix itself without treatment, but some treatments have been known to help. I would say try taking viatmin E supplements which have been known to help, and if you're seeing no results, I would reccomend seeing a doctor (specifically a urologist), who can reccommend additional treatments.  Surgery is also available, but should only be performed in extreme cases due to the complicated nature of the procedure.  \n\nYou can find some addional information at this website:\n\nhttp://www.ethex.com/emyhealth/data/Curved_Penis.asp
724126
It becomes engorged with additional blood into its veins and arteries during an erection.\n\nIf you are really asking, "how can I get my penis bigger," you can't.  It's based on genetics.  Any "supplements" or pumps will work only temporarily and are a waste of money.
202868
In addition to sexual arousal, erection in males can be caused by mechanical stimulation, or by the pressure of the filled urinary bladder. Erections when waking up are common, most likely due to a full bladder. They sometimes already occur in infant boys, and in utero. Recently some scientists have begun to doubt this very much (sources: see below). The question why most men have erections when waking up ("mo**ing w*od") is still not settled.  http://en.wikipedia.org/wiki/Erection
399953
OK... first make ur penis erect .. then...take hold of ur penis's tip ... excite ur penis that much that it begins to say  "aaahaaaaa"
764116
Most men have erection problems at some time in their life.  Only a doctor can tell you if it's physical or emotional.  Life's too short to have a problem and not get it fixed.  Please make an appointment with your doctor.