For most people this is probably true. But what about those fringe elements who are watching Dr. Who for sexual gratification? Or someone who uses a crucifix to stimulate themselves sexually? Should these items be banned because they can be used to stimulate? And what if the judge should find something sexually stimulating that you do not? There are many different fetishes out there. Not everyone is stimulated by them all. Which ones should be banned?
The key here, I think, is that the Act in question specifies that the images must be produced (not looked at) "solely or principally" for purposes of sexual gratification.

No, it's a crapshoot when you let the government run the bedroom. Especially since a seemingly large percentage of government officials are among the worst offenders.
I'm in full agreement. But it seems that the militant wing of the modern puritan movement is more influential, at least, here in the UK