How large should sex last?
But what's a "standard" amount of time to wait for ejaculation? The Journal of Reproductive Medication published a study in 2005 that had 1,587 women period sex with a man from initial penetration to climax and found that the men diagnosed with premature ejaculation climaxed in an average of 1.8 minutes, while the others performed for an average of 7.3 minutes—a contrast of just five and a half minutes. Erections are caused by the release of nitric oxide, a neurotransmitter that's produced in the nerve tissue, which helps the muscles to relax and allows blood to flow to the penis. There are some 30 million men suffering from erectile dysfunction, and several causes have been identified that include poor blood flow, heart disease and obesity. Erectile dysfunction is also a side effect of many common medications, including antidepressants, diuretics, and beta-blockers. Treatment for erectile dysfunction is primarily the prescription drugs Viagra, Levitra, or Cialis. However, this class of drugs has been know to cause serious side effect, such as headache, dizziness, mood changes, heart problems, neuropathy, and even seizures.