As for iguanas and general tameness and human interaction.. it really depends on the individual iguanas personality and your approach to properly taming it. There are variables to consider.. proper caging and cage environment, exposure in household etc. Taming takes a lot of time and patience.. weeks sometimes months. I frequently visit this formum.. when purchasing an iguana always get captive bred iguanas. Its winter so shipping can be a nightmare.. but they are much healthier than farm raised imports that pet stores have. Oh and male vs female igs.. mating season lasts typically a few weeks at most. Some are agressive, some are not during this time. Females lay eggs be it they mate or not.. so they will make some owners crazy either way lol.
There are also different sub species of iguanas to consider. Cuban iguanas and rhino iguanas are a far more intelligent species and tame up nicer in general. They need more space as they are a terrestrial reptile not really big on climbing like the greens. Bearded dragons and uromastyx are probably the most tame reptile you can purchase.. and much smaller. I am a big big fan of uromastyx as they are typically incredibly docile and produce vivid colors - but their cage environment has to be set properly as they love the heat.
Rhino and cuban iguanas as well as uromastyx cost more on average but all are better reptiles to keep.