Does the Penis Learn or Is It Mental?

Wow. Two questions in a single day. I really have too much free time right now. I’ve been pondering the reasons behind this. “I don’t get hard while my cage is on and C’s pussy gets fucked.” The horniness is still there; I leak, sometimes even after peeing with cum inside me, so I am definitely horny. Yet, staying erect isn’t the norm for me. It feels very erotic and satisfying. I’ve moved into a spot where C’s orgasm gives me sexual fulfillment too. In fact, to my mind, she releases me more often than necessary because I’m already happy with what I get. And when she does let me out? It takes a moment for me to realize it’s actually permitted. I do achieve erections for other reasons though. Seeing C’s breasts always triggers one. I figure this is because I’m allowed to fuck those, and often during milking sessions, I’m looking right at them. When C mentions she’ll keep me locked up or use me, my cock rises—but not necessarily while being used? However, if she tells me beforehand that there will be a release later for follow-up play, I get hard and prepared. So.. Does the body re-train itself? Or does the penis learn? The earlier question about permanent locking makes me wonder: Does the penis just stop trying because it knows an erection isn’t required? I’m curious if this is how it goes for others over time?