
In my opinion, anything that the partner wouldn't consent to if they knew, and you have to hide it from.
Might sound ironic, but for example my wife and I do (very) occasionally involve another woman for special activities, and this is not cheating in our book. But if I confided in another woman for example, more than I did with my wife, without her knowing, that would be cheating for her, even if nothing phisical happened.
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