 Some women have had difficulties urinating or sustaining sexual intercourse after prolonged periods on their bike saddle.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% – may ultimately get erectile dysfunction problems if a poor cycling technique is used with prolonged pressure on the perineum.