Important PSA for authors, fanfic writers, and roleplayers
Erection is an autonomic response controlled by the parasympathetic nervous system, specifically the pelvic splanchnic nerves. It’s literally all below the brain – meaning what’s going on in your head has little to nothing to do with whether or not you get a hard-on. The body only understands sensation, not circumstance.
Or, in layman’s term, AN ERECTION IS NOT CONSENT.