Is watching/looking at porn cheating?

This seems to be appearing a lot lately on forums, "My partner cheated on me, they watched porn." I mean I don't see the issue. How is it different than reading a saucy romance novel where the sex is described in great detail? If you're just watching/looking/reading, and not engaging with someone else (in person or on a live cam etc), then I don't think it's cheating. I'm curious what other GLOW users think.

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