Healthy blood oxygen levels are essential to achieving and maintaining an erection. In fact, the higher levels of oxygen in your blood, the better sex you’re going to have. So if you have low oxygen levels, you aren’t going to get those rock hard erections you’re used to. Unfortunately, simple aging can cause those low oxygen levels you’re trying to avoid. And since there’s no way to prevent aging, it’s easy to think there’s nothing you can do about the low oxygen levels. However, there are steps you can take to raise your blood oxygen levels.