Is watching porn cheating?

Depends, if you're hiding that you're doing it from your s/o then you're being dishonest in the relationship

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Dishonestly and secrecy are the core elements of cheating. So while I personally don't think it should be seen as cheating, that would also depend on the expectations you and your partner have

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Dishonestly and secrecy are the core elements of cheating. So while I personally don't think it should be seen as cheating, that would also depend on the expectations you and your partner have