To be sure, the mechanism of penile erection can be affected by any number of factors-job pressure, smoking, high blood pressure, high blood fats, and diabetes, for example-but for the most part, the cause can be summed up in a simple, nasty phrase: "You're getting older."
不必找理由，工作壓力、煙酒、高血壓、高血脂、糖尿病等，無疑都是陰莖海綿體的靜竇脈充血不足、無法勃起的可能原因。不過歸根結底，最主要還是那句話──你「老化」啦。雄風不再？