Good Day,,,I am a Filipino,Male, 28 years old, married with one child.A teacher and works from monday to sunday. My problem is when we have sexual intercourse with my wife during fore play my erection is good but when i try to insert my penis the erection slowly goes down.because of this we do not have a succeSsfull sexual intercourse.This was started since August 2014 until now. I ll take some tea to increase aphrodisiac, the tea named Lee Rhino tea. and it is not good.is this an erectile dysfunction at my young age?what shall I do...please give me some advice or maybe a vitamins that will treat my problem....thank you and i am waiting for your response...thank you so much doctor.