I'm 29 year old and spend successfully 5 years of married life but now from one or two months I noticed continuous change in my sexual life. My penis seems small and not erecting easily. If it got erect by rubbing then while sex its losing erection. Earlier I was involved in frequent masturbation and smoking. But now a day I'm quite smoking. I'm having high blood cholesterol and high triglycerides problem with high pulse rate. Please suggest what medicines I have to take to treat ED? Also viagra (how much mg) is safe for me? I'm very much in tension pls suggest!