Dear service user, Thank you for writing to Healthcaremagic. I understand you concern about perceived effect of 3.5 inch penis on sexual satisfaction of your partner. I can also understand that you reach climax in 6 to 8 minutes. Well, the fact is that the size and width of penis varies greatly from one person to person both in erect and non erect states. There is no fix figure which can be considered normal . Another important and more practical fact is that the size of penis has nothing to do with sexual satisfaction of the partner. It is entry followed by continuous thrusting movement considered as sufficient. The method of lovemaking according to partner s preference rather than size is more important. Both of you should see sex therapist or psychiatrist to discuss this. Sexual sensations are in the outer aspect of vagina i.e. the clitoris, inner lips and lower one third vagina. Inner two third of vagina is largely insensitive. For premature ejaculation, Following methods, in combination often help to delay the climax. 1. Stop-start technique of behavior therapy. 2. Female on top with active role. 3. Double condom 4. Medicines like Fluoxetine 20 mg day or Paroxetine CR 25 mg per day. (To be taken under medical supervision only) 5. Pelvic muscle strengthening exercise. (As if try to hold urine intermittently during voiding) 6. Penile squeeze technique applied at the point of ejaculatory inevitability. 7. Applying a local anesthetic ointment to glans penis prior to penetration. Continue thyroid treatment as per your physician s advice. I hope I addressed all the concerns properly. Wish you great sexual life ahead.