Hi I am 28 years old. I masterbate twice/thrice a week, when I masterbate my pennis erection and ejaculation are normal. But when I am having intercourse my pennis gets erection normally but while inserting, in 30 - 40 seconds the erection reduces and ejaculation doesn't happen. Please help me to overcome this problem. I am a social smoker and drinker(once /twice in a fortnight) and never took any medicines or drugs before.