The thing about that is, he believes Tony. Nothing about it seems like he's in denial about his hunger. There's the possibility that he's reading himself wrong, but Bruce is ready to believe what Tony says for now, anyway. Eventually, he's going to get hungry, but that time isn't now.

"Okay, I just couldn't tell. The way you were looking at me and smelling me..." He already thought this joke to himself, but Tony didn't hear it, which means he can repeat it. "You were either thinking of eating me or having sex with me, and both are now possible in ways they weren't before."