This is a question often asked by my patients who are unable to have a satisfactory sexual experience.
Broadly speaking, if the problem is sudden or of short duration, happens with a particular partner or with underlying stress or fear of performance etc, we label it is psychogenic.
This is common in young men, Newly married men or those facing stressful situations. It is usually without any underlying disease in the body and responds well to relaxation, counseling and medication.
Sometimes, the stress may be very severe and more aggressive methods such as penile injections have to be used as treatment.
Majority of men with a psychogenic affection of their sexual function will recover and be free of medication over a period of time.
It is important for the partner to be caring and understanding in such a situation. This helps in reducing the stress of the man.