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Q. What are the major differences between the two devices? The most common cause of male infertility is a varicocele (say: "var-ee-koh-seal"). This is when the veins in the scrotum (the skin "sack" that hangs beneath the penis) are dilated (enlarged) on 1 or both sides. This heats the inside of the scrotum and may affect sperm production. A blockage in a man's reproductive system may cause male infertility. Some medicines can also cause infertility. I have bought viagra here generic viagra online without prescription Inexpensive Need to take medication every day How common is erectile dysfunction? buy Viagra 25mg here where to buy viagra without prescription