During the 20th century alone, the population in the world has grown from 1.65 billion to 6 billion. In 1970, there were roughly half as many people in the world as there are now. Because of declining growth rates, it will now take over 200 years to double again.
In some cases you can take a different medicine that doesn't cause erection problems. Taking prescription medicine that can help you get erections. These include pills such as sildenafil (for example, Viagra), tadalafil (for example, Cialis), and vardenafil (for example, Levitra).
If blood flow is sporadic or not strong enough, a man canât keep his erection for very long. In some cases, he wonât be able to get one at all. Doctors call this condition erectile dysfunction, or ED. Many older men have this, and there are very various causes for it other than low blood flow.