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Deconstructed: Might get Bob in trouble or shamed since it's not a socially-acceptable pastime. Also, Alice might get jealous, or worry about the example he's setting for their son.
Reconstructed: Bob is discreet, whatever images he ogles, and doesn't use them as a substitute for Alice.
Played For Laughs: Bob's Porn Stash is composed by some seriously strange magazines, like guns magazines! (just to name one example) They don't even have a single girl (nor guy) in them, guns are the only things in them!
Played For Drama: Alice gets jealous and upset, and threatens to leave.