Ok, I've changed my mind on this. I thought he was just a little slow to get the punchline of this rather obvious joke... but now..
I think he was hard-core white-knighting here. Why? Well, I wasn't aware of the sheer emasculation his wife has imposed on him. An open marriage, sleeping around unapologetically, and ever since then he's been absolutely confused. I think he's been trying to regain that masculinity since, yet unsure what really to do.
It doesn't seem staged now that I look at his face, and Rock's reaction. But I'm still not 100% sure. Hell, maybe a week from now they will both come out and sat, "See Jussie - that's how it's done". And they would be right.