Dear service user, Thanks for writing to Healthcaremagic. I understand your concerns. Masturbation is similar to sex with female. What your penis do in vagina, it does same in folded hand during masturbation. Sex with female does not cause any health hazards so how masturbation can do...! Masturbation is a normal and healthy part of sexual satisfaction. It does not have any adverse health effects or impotence. There is no specific time period defined for ejaculatory delay. It greatly varies from person to person. One can gain ejaculatory control over a period of time by practicing behavior methods as below, 1. Stop-start technique of behavior therapy. 2. Medicines like Fluoxetine 20 mg day or Paroxetine CR 25 mg per day. (To be taken under medical supervision only) 3. Kegel exercise. (As if try to hold urine intermittently during voiding, you can search on internet and read in detail) 4. Penile squeeze technique applied at the point of ejaculatory inevitability. You can master these techniques if you practice them regularly. Your penis size is normal. In fact penis size has no effect on sexual satisfaction of the partner. Its only lower vagina, clitoris and inner lips are sensitive to stimulation. Inner 2/3 vagina is insensitive. Size of erect penis anything more than 2 inch is enough for sex. If you have any further questions I will be happy to help. Wish you good health and happy sex life ahead.