Yep. And they also develop what seems to be random likes and dislikes. For instance, in general, no one knows why some iguanas form a seeming hatred for their caregivers, and demonstrate fondness for his/her spouse. They may also hate a particular perfume, and certain colors and patterns of clothing, such as polka-dot.
How does your ig react to visitors?
It could be something as crazy as reacting to your wife's pregnancy by wanting to claim her as part of his harem. In the wild, male Igs are pretty rough on their mates and especially on nearby males. No one has proven or disproved that theory, but ig owners keep trying to figure this out by continually comparing notes on forums like this one.