偶而騎是可以的 但 長時間騎腳踏車時 坐在腳踏車座位的壓力會擠壓對小弟弟供血的動脈和下陰的神經而引響產生快感及供血的能力 使得對小弟弟勃起的功能產生不好的影響 長久下來會導致陽痿 .... 要長時的當成運動的話 小弟認為應該還有別的運動可以代替吧..個人意見吧 除非現在的腳踏車座位有更好的設計

http://www.spongywonder.com/medicalinfo.htm

The area in question is the perineum, between the external genitals and the anus. "When you sit on a chair you never put weight on the perineum," Dr. Schrader said. "But when you sit on a bike, you increase pressure on the perineum" sevenfold.

In men, a sheath in the perineum, called Alcock's canal, contains an artery and a nerve that supply the penis with blood and sensation. The canal runs along the side of a bone, Dr. Goldstein said, and when a cyclist sits hard on a narrow saddle, the artery and the nerve are compressed. Over time, a reduction of blood flow can mean that there is not enough pressure to achieve full erection.