Hello
@Mikeman123
Understanding how the penis (erectile function) works will give you the clearest response. If you have access to my book, it explains this in detail.
Erection is triggered by nerve stimulation and the release of nitric oxide in the arteries that bring blood to the depth of the cavernosum bodies.
The cavernosum bodies are spongy-like tissue that, when relaxed by the mentioned stimuli, get filled with blood bringing stiffness to the penis. This all happens in the center of the penis, to make it simple to explain.
Now, let's move to the anatomical structures:
The cavernosum bodies are covered by two membranes (deep and superficial fascias) and other tissues that isolate them. PMMA (and all fillers) are placed on top of the deep fascia that physically separates the deep area where the erection occurs from the superficial area where the fillers are injected.
In short, there is no logical, physical, or anatomical reason why the implant of any filler should interfere with erection.
Also, remember that the highest percentage of cases of erectile dysfunction is psychological.
DrC