Hello dear Understand your concern I think it is due to performance anxiety, stress, fatigue and relation ship issue mainly. If problem persists you should consult the psychiatric and need following investigation like semen analysis, hormone analysis, color doppler of penile area, blood sugar, blood pressor measurement, PSA etc Take following advice: Be relax while having sex, make environment romantic, engage more in fore play, use comfortable position like women on top, talk to your partner to reduce problem, use double condoms, start exercise like yoga and walking 45 minutes daily in morning. If above advice does not responds You can take sildenafil plus paroxentine 30 minutes before sex Tablet Co Q and gonadil F Hope this may help you Best regards Dr. Sagar