However, Walton, cycling may increase the risk of having impotence (無能/陽萎)!
http://hk.news.yahoo.com/%E9%95%B7%E6%9C%9F%E8%B8%8F%E5%96%AE%E8%BB%8A%E6%9C%89%E9%99%BD%E7%97%BF%E9%A2%A8%E9%9A%AA-223000836.html
But... only happen when you cycle everyday consecutively and last for at least 5 years.... I think of one of the tutors in Keele.....
