Hello, I have one thing not clear, and I'm very afraid of this. I masturbated a lot, when I say a lot, it means 13-14 times, but I did this after stopping ejaculation for 2 hours continually ( I masturbates and when comes the end, I stopped masturbating and ejaculation - i did many times till i felt pain in my testicular). This was done not every day, but i can say after 2 weeks. I stopped doing this because I was and I'm afraid of being sterile, because my sperm sometimes is not thick. I need help. I will not do this more, but I need to have my mind clear for the future :)