Boiled juice of water melon & lime cures weak erection ? my friend suggested it & it acts as n atural viagra (sildenafil) . is it cures...?

Are you serious: You don't actually believe that do you? There are multiple causes of erectile dysfunction and none of them will improve with fruit juice or any herbal rx, supplement, etc. You hear about from friends, tv or the internet. Save your money and your health. There are many physical and psychological causes of erectile dysfunction. Check w/your doctor.