Here are some more reasons why intercourse is an excellent way to relieve stress. One in the major human activities leading for the irreversible biodiversity loss is the overexploitation of certain animals. This occurs when the human destruction or usage of a species outpaces that species' capability to reproduce. This often occurs when certain organisms are highly prized by humans, which could be the case with animals and plants whose parts are utilized as medicinal therapies in most societies. Sadly, three with the Earth's eight species of tiger happen to be extinct. What's worse? The five remaining species are gravely endangered, partly due on the interest in their bones, which are believed to treat arthritis, and erroneously believed to reverse male impotence. Exploitation also affects plants as well including popular wild-grown medicines ' including Echinacea, the normal cold remedy. Use the tried and tested Chinese herb Horny Goat Weed which is known to help nitric oxide realize. The not so well known Chinese herb Cnidium, is also a great libido Nitric oxide booster. Research in the United States shows that the failure rate is 15% to 28% per annum. And, both men and women are frustrated by having to interrupt at the last moment.