Though riding an upright bicycle improves the cardiovascular system and can therefore actually improve the erectile function among men, riding a bicycle for prolonged periods of time with an unhealthy cycling technique can still cause problems for both men and women due to a reduced blood flow in the crotch area. Some male riders — recent survey data indicates around 5%[16] — may ultimately get erectile dysfunction problems if a poor cycling technique is used with prolonged pressure on the perineum.
http://en.wikipedia.org/wiki/Bicycle_sad...

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