Male erection and muscle relaxant

[sacredpornondw]

Long version: Can a guy get an erection after being injected with a muscle relaxant / neuromuscular blocking drug?
Setting: Modern day USA


Hi! I'm writing a story where a guy is captured to be studied in a laboratory. For varies reasons, I need him to be able to get an erection after being put under a muscle relaxant (or more specifically, a neuromuscular blocking drug), and I'd like to make sure that it is feasible.

I've read some Wiki articles regarding the topic (links to articles at the end of this post) but they pretty much went over my head. From what I gathered, a fully paralyzed patient is unable to move, speak, blink the eyes but able to feel stimulation. Since male erection can happen involuntary, this guy should be able to get an erection given sufficient stimulation even though he can't voluntarily move his limbs around, right?

I really hope the story can work out this way, but if not, any suggestions as to how I can prevent this guy from moving (without using any physical restraint such as handcuffs) while keeping him capable of an erection?

Some of the articles I've read:
Anesthesia awareness - Paralytics/muscle relaxant use
Muscle relaxant
Neuromuscular-blocking drug
Erection
Death erection
Priapism
Nocturnal penile tumescence

Thank you!