Hello Doctor, Good morning.I have a problem of my penis not getting stronger. I come to home late night around 11pm. I am very interested in participating sex with my wife.I feel low when my penis is not becoming strong.Also my penis is becoming strong when i try to do masturbate.I feel like to have sex in mrng time around 3 to 4am. Now I am at age of 32. Could you please help me out with this issue. Thanks.