This occurs when there is a persistent inability to obtain and maintain an erection until completion of sexual activity. With the advent of sildenafil (Viagra) in 1998, erectile dysfunction has become negotiable for everyone with an increasing demand for help. Sometimes erectile dysfunction is the first symptom of an underlying medical or sexological disorder.
Somatic factors:
Sexual factors:
Psychological factors:
Erectile dysfunction may be a sign of cardiovascular deterioration. Then it is advised to determine cholesterol, fasting sugar blood level, thyroid function.