Hello, I am 23 year old newly married male and my question is related to my sex life. During sex time my penis is not get stronger enough, I mean not get easily And one thing is there that I am not feeling energy during sex. I am still not using viagra because have fear for side effect. So how viagra is good if I take it continuously? And if I take viagra then how much time the effect of viagra is stay in the body. So can you please give me some advice for my better sex life.