Every time you ejaculate, your pituitary gland produces a surge of oxytocin and prolactin, hormones that make you relax. These hormones suppress dopamine, the neurotransmitter responsible for arousal. Scientists suspect that lengthened refractory periods are caused by age-related changes in the pituitary system, which disrupt the balance of oxytocin and prolactin and suppress dopamine. One natural solution: Raise your dopamine levels by eating more foods rich in vitamins B6, B12, and folate, such as chickpeas, tuna, and asparagus.
I stick to tuna, if you're not a fan of fish, move on to hummus, beef liver, and or; Spinach/Collard greens. Remember, your body starts absorbing the nutrients from said foods, 3-6 hours after you eat. So you want to time it accordingly. I always eat 4-6 ours before sex anyway, especially when all you need is one can of tuna. Beyond that, its natural virility and testosterone.