Is it safe to use delay spray on my penis for intercourse to have kids?

Not useful: If by delay spray you mean a local anesthetic to prolong the duration of intercourse, it would not help you in procreating. In fact the fewer chemicals you introduce into the reproductive system, the better. For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form.