<s>[INST] Hello, I do not at all enjoy having sex using condoms. The problem is that during intercourse after 3-5 mins I lose erection and it does not come back at any cost. But without comdom I feel the true sensation inside vagina and hence do not lose erection. Infact I can last for hrs without condoms. As we all know the essence of having protected sex, I am really frustrated with the comdom thing. It does protect us from STDs but it kills the very sensation and ecstasy of a sexual encounter. I greatly dislike using condoms for the very two reasons: 1. It does provide the real sensation and 2. It kills the erection. I have tried every other brand of comdom available in the market but none of them has helped me. Moreover I am a very athletic guy with great libido and sexual endurance. What am I supposed to do? And one more thing, what are the best ways to prevent or decrease the probability of STD infections after an unprotected sex? [/INST] Hello, If you are uncomfortable with condoms, then use other methods of contraception. You can't prevent STDs by unprotected sex. You have to use contraception. Other causes of erectile dysfunction are:-1) Psychological2) Stress3) Fatigue4) Diabetes5) Other chronic illness.6) Spinal cord injury. You can tablet sildenafil one hour before intercourse after consultation. Treatment mainly depends upon underlying conditions. Kindly follow with detailed history or consult with sex expert. Hope I have answered your query. Let me know if I can assist you further. </s>