1- Eat Nutritious Food.
Fruits, Vegs, Protein and alot of Water.
2- Have Sex/Masterbate Less often.
3 days is fine between each ejaculation.
3- Quit smoking, Limit Alcohol.
Toxins will not only damage sex, but your life also.
4- Lose any excess weight.
Too much Body fat won't do you any good, reduce it to %7-%19.
5- Avoid heating your testicles/wearing tight underwear.
Wearing some type of cotton/tight undies will hold the heat on your testicles.
Don't have a hot tub, but shower instead.
6- Exercise your PC muscles.
Better PC muscles contractions will make you ejaculate more.
7- Try to get rid of stress in your life, relax.
Stress will bring you Premature Ejaculation.
8- L-Arginine and Zinc pills is suggested.
Semen contains citric acid, free amino acids, fructose, enzymes, phosphorylcholine, prostaglandin, potassium, and zinc.
9- Make love early in the morning.
Semen is at the most at the early mornings.