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).
Quick GuideSex-Drive Killers: The Causes of Low Libido. Erectile dysfunction (impotence) facts. Erectile dysfunction (ED), also known as impotence, is the inability to have a hard erection initially and/or to have a hard erection that lasts long enough for sexual activity. Symptoms of erectile dysfunction include lack of an erection hard enough for penetration and/or lasting long enough for completion of sexual activity.