Hello dear I understand your concern Bezocaine does not cause permanent numbness. Condom containing anesthetics help in sustaining erection and make the act last longer. It cause desensitization of local nerve ending present of the head of penis. There is just local irritation because of local contact allergy or some numbness in your penis. Erectile dysfunction is not due to durex extended release. It could be due to performance anxiety, stress, fatigue. Avoid stress, anxiety and try after 1-2 days. If still persists then consult the urologist to find the cause of problem Drink plenty of water, do regular exercise, avoid stress, do regular exercise. Hope this may help you Contact further if follow up needed Best regards Dr. Sagar