The penis is the male sex organ, and the shaft of it is the longest part. The glans and head are located at the end of the shaft. The opening at the tip of the head when semen and urine come out is termed the meatus. Inside the shaft are two cylinder-shaped chambers called the corpora cavernosa and they run the length of the penis. They have blood vessels, maze, open pockets, tissue, and others.
Remember those cultural messages we discussed earlier, about how men are wild sex aliens from the planet Weenus? Well, men are raised hearing those messages, too, and they can end up screwing with their sexual self-image —for instance, they can lead men to obsess over their own virility, and panic about impressing a new partner, until they've thought their boner into a corner and can't get an erection. Performance anxiety is one of the most common culprits behind lost erections, especially among younger, less experienced men.
The vascular processes that produce an erection are controlled by the nervous system and certain prescription medications may have the side effect of interfering with necessary nerve signals. Among the possible culprits are a variety of stimulants, sedatives, diuretics, antihistamines, and drugs to treat high blood pressure, cancer, or depression. But never stop a medication unless your doctor tells you to. In addition, alcohol, tobacco, and illegal drugs, such as marijuana, may contribute to the dysfunction.
Research has shown that the same eating patterns that can cause heart attacks due to restricted blood flow in the coronary arteries can also impede blood flow to and within the penis. The blood flow is needed for the penis to become erect. Diets that include very few fruits and vegetables along with lots of fatty, fried, and processed foods can contribute to decreased blood circulation throughout the body. 

If he's over 40 and not the most healthy, then years of "bad habits" could have provoked the incident; lack of exercise, shitty eating, alcohol abuse, drugs, tobacco, all damage our blood vessels. The same exact blood vessels that take the long juan from 6 to 12. Plus, you guys were taking a hot bath together, which also thins blood. So, right off the bat, there are six different variables you have no control over. If his exterior his A-ok, then lets dig deeper...

While the end product is the same, the journeys take three very different routes. The most common erection is your reflexogenic erection, caused by physical contact. The second is your psychogenic erection, caused by audiovisual arousal or imagination (but no contact). The third and final is your nocturnal erection that comes when you are in the deep REM stage of sleep – and which, in fact, has very little do to with sexual stimulation.
Exercise on a regular basis. There is evidence that suggests that a sedentary lifestyle can be a factor in erectile dysfunction. Aerobic exercises, such as running and swimming, can help prevent ED. The exercise can help improve blood flow and circulation, naturally help lower high blood pressure and cholesterol, and can even help improve hormonal balance and drive weight loss – all of which are factors that can help you improve ED and maintain an erection.

Apart from that, one can also have better sex due to the excellent flow of blood in the dick. One can experience intense orgasms as well. If you are the one who is suffering from any issue of erectile dysfunction or even the premature ejaculation, then this device can assist in curing all by normalizing the flow of blood in the penis and even relaxing the penis veins.

There are many factors that can lead to ED. “Psychological causes of erectile dysfunction in young men can include performance anxiety, guilt about sex in general, guilt about having sex with a particular partner, feelings of anger or resentment towards a partner, or simply finding a partner undesirable,” said Carole Lieberman, MD, a psychiatrist on the clinical faculty of the UCLA Neuropsychiatric Institute in Los Angeles.
While physical anatomy and chemical reaction are both important for getting and keeping an erection, the brain is one of the most vital parts of this puzzle. "An erection is controlled by multiple areas of your brain, including the hypothalamus, limbic system and cerebral cortex," notes Axe. "Stimulatory messages are sent to your spinal erection centers and this facilitates an erection. When there's an issue with your brain's ability to send these important messages, it can increase the smooth muscle tone in your penis and prevent the relaxation that is necessary to get an erection."

"Smoking is a short- and long-term cause of erectile dysfunction," warns Feloney. "In the short-term nicotine constricts the blood vessels that you need to get an erection, and in the long-term nicotine contributes to hardening of the arteries that can cause erectile dysfunction." Some approaches for quitting include making a clean break, avoiding the triggers of smoking, trying a nicotine patch or gum, and joining a smoke cessation program.
And be aware that the vast majority of physical or psychological causes of erectile dysfunction are temporary. They may go away as quickly as they occurred. But if anything is bothering you or your partner, you should seek out confidential, professional advice. There is no point in worrying and not doing anything about it. It may just make the situation worse.
If the problem is physical, there are numerous treatments available, such as penile injections or penile revascularization surgery, which increases blood flow to the cavernosal artery of the penis. There are also medications like Viagra, Cialis and Levitra, but Lehmiller cautioned men with erectile difficulties not to self-medicate without seeing a doctor beforehand due to the potential negative side effects associated with such medications (such as chest pain or shortness of breath).
Obesity. Obesity itself is not a risk factor for ED — but there is a connection. “The bigger concern is that obesity can lead to type 2 diabetes or vascular diseases, which are risk factors for ED,” says Montague. Morbid obesity, a term used to classify individuals who are significantly overweight, can cause hormonal changes that are triggered by excess body fat. In addition, obesity can put physical limitations on sexual intercourse.

The production factory of your semen is on an industrial scale, constructed from multiple locations in your genitourinary system. First there are the stars of the show, your spermatozoa, which are naturally synthesised in the seminiferous tubules within your testicles. During the ejaculation process, these then pass through your ejaculatory ducts and blend with fluids from your prostate, seminal vesicles and bulbourethral glands. This melting pot forms your semen as it arrives via urethral meatus (the end of your penis) to the cold light of day – or night.
Sit down with your partner and talk honestly about your sex together. Is it good? Do you both like it? This is important, because feeling discontent can cause you to lose an erection frequently. So open up. Maybe one or both of you isn’t enjoying the sex anymore. You can definitely improve the quality of sex that you have, but it’s start with honesty. Frequency, intensity, and a number of other things from scents to bad breath can dramatically impact sex.
Remember those cultural messages we discussed earlier, about how men are wild sex aliens from the planet Weenus? Well, men are raised hearing those messages, too, and they can end up screwing with their sexual self-image —for instance, they can lead men to obsess over their own virility, and panic about impressing a new partner, until they've thought their boner into a corner and can't get an erection. Performance anxiety is one of the most common culprits behind lost erections, especially among younger, less experienced men.

How can I improve my erectile dysfunction?

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