I am a father of 1 son who is 15 years.past 2 years i am not able to have sex with my wife.i am not having a strong erection.i am 40 years.

Erectile dysfunction: Erectile dysfunction or impotence is inability to obtain & maintain an erection adequate for sexual relations. Stress is most common cause, eg job, money, family, etc. Lifestyle choices are next, eg tobacco, excess alcohol, etc. Then we consider your health, eg cholesterol, blood pressure, depression, etc. Don't forget medication side effects. Finally consider testosterone. Go see ur family doc.