I started taking Saw Palmetto capsules to prevent prostate problems. I'm getting better at my exams. One side effect that I noticed is that it has greatly improved my performance with my partner.
Your experience is spot on. There are many issues that often lead to a reduction of "performance", yet lots of people go for band aid solutions such as Viagra, which do not solve their issues long term but instead make it worse. For example, men with Hypertension will most often develop Erectile Dysfunction which may be helped short term by Viagra but the underlying root cause remains.
One advantage of herbals is that they are non-specific and thus act on your entire body instead of attacking a single organ or organ system, which helps you to gain whole health.