Hello dear.. First of all remove all myths & misconceptions from your mind about masturbation. In fact, Masturbation is completely normal & doesn t have any bad effect to the body. And the sperm production continues throughout life & doesn t get empty on masturbating. Regarding the problem of premature ejaculation, it s mostly related to anxiety that whether you will be able to perform or not. So...don t worry about all this & stay relaxed. Performance can be improved by having a diet rich in fruits, vegetables, fish, nuts & honey. You can also do oil massage of the penis...it increases blood flow & maintains the erection. Avoid smoking & alcohol. One more thing...avoid consuming any over the counter medication which claim to increase the size of penis or improve performance...it may be harmful. Best thing is to eat a healthy diet, exercise regularly, avoid stress, get good sleep, think positive and stay happy. Wishing you a Healthy Life. Take care