An apple a day doesn’t just keep the doctor away; it may also help to extend your sexual stamina. It’s all thanks to apples’ high levels of quercetin, an antioxidant flavonoid that has been found to play a role in improving endurance. And since your body goes through many of the same physical changes during sex as it does during exercise—elevated heart rate, increased metabolism, burned calories, and muscle contractions—you can equate endurance with extending your time in bed. According to Nashville-based nutritionist Sarah-Jane Bedwell, RD, LDN, quercetin “can help to create new mitochondria in the body’s cells and increase one’s oxidative capacity, which signifies the maximum amount of oxygen your muscles can use.” That’s not all. Quercetin can also help prevent the release of cortisone, which causes muscle breakdown, meaning you’ll be able to go at it longer without experiencing premature fatigue.