That's up to the jury. I'll defer to their judgement and in the absence of additional information (information neither of us possesses) that is the only reasonable position to take.
My position on the findings of the various juries involved in the various trials is that I should defer to their analysis of the evidence-- and that is the only reasonable position to take in the absence of more information, information neither of us has.
The most reliable way of not getting caught out storing dodgy images on your computer is to not procure them in the first place.
And, it's better for keeping a healthy and well-adjusted attitude towards sexual desire, rather than being trained on whatever pornographers want to you see. From an ethical point of view, not being complicit in the sexual abuse that is so rife in the porn industry is also a big plus.
Holy cow did previous generations / civilizations love to collect lewd sculptures and paintings.