Well, not sure what you mean for certain.

However, nerve blocks are used to reduce pain, or reduce nerve signals.

The pudendal nerve services the general pelvic floor, iirc. I know that it can get impinged and end up causing a wide range of problems, with chronic pain being the most common.

By injecting the nerve and surrounding tissues with medication, you can reduce or even eliminate that.

Back before ultrasound, you'd have to palpate to feel the site to know exactly where to inject. The image shows the approach used to do so. Afaik, nobody does it like this nowadays. It's all done with imaging, with ultrasound being the default to the best of my knowledge.

In other words, if yo junk is burning, taking a finger up the ass and a needle in the taint might actually be better.