@MoonbeamsGlittering I agree.
My partner and I have never vouched fidelity to one another, that was not the bargain we made when we met and later married. That it has turned out to be that way does not mean it was intended to be that way. If one day fidelity's broken and my partner gets upset, I've got enough "receipts" of conversations we had over twenty years ago, prior to getting married, where we explicitly opted out of any fidelity requirements. And we've never revisited or sought to amend that.
I say that if there is no fidelity requirement there ought to be no no-porn requirement either (or using movies as porn, etc), as porn ranks lower than a break of fidelity. However, porn has never been explicitly discussed. I've intently always omitted mentioning it (and partner didn't either). My partner knows about Incognito browsing and so do I. I do not inspect the router logs. My partner wouldn't know how to get to the logs, but if they could, for the most part all they'd see is regular sites, such as Vimeo, DailyMotion, the Internet Archive, YouTube!, on occasion some Eastern European or Russian web sites where lots of pirated movies of all kinds are found. But my partner would never know what I watched as when the connection is over HTTPS the router log doesn't log the full URL, only the site. For anything else there is Tor (and not that it is much needed at all, but sometimes ordinary movies can't be found in their entirety other than on porn sites, for some reason, though it is the exception rather than the rule, and of course the logs record a visit to the site, although not over Tor).
Frankly I do not understand how people can get pleasure watching regular porn clips. I find those not inspiring at all, and the more explicit it is, the less it inspires me. If I depended on those for my pleasure I'd be wasting my time looking for clips for an hour till I've had enough and I give up and walk away. It just does not work. Perhaps my brain does not work as that of the average man. Anyway, I'm quite happy the way it works, I wouldn't change it.
I'd say this to ladies, the issue of men watching porn is no big deal. Yes, it uses material suspect of originating from exploitation of people, and that's a valid objection and if they feel strongly about that I agree they make their views known and even try to enforce it. But it's the same someone feeling strongly about animal abuse and trying to turn their partner vegetarian, or someone against sweatshops or child labor and trying to ensure their partner only buys certified ethical / fair trade goods. And yes I agree that exploiting people sexually is more abhorrent than underpaying people or killing animals for food or fur, specially minors and vulnerable people (and probably only comparable in its abhorrence as keeping slaves or stealing organs off people). But people just don't have the same moral principles. Asking men not to watch porn because it harms people is a moral imposition. Women who think like that should start by saying, "I want to dictate the following moral imposition, or restriction, upon you, and ensure that you'll live by my morals as regards to the following..." and proceed to explain the issue of porn actor exploitation and therefore the ban on porn. The issue of watching porn is a big deal only if for you personally it is a big deal, or immoral, it is not a big deal universally (and it is not illegal).
And separately discuss the issue of whether watching porn constitutes infidelity, even when it does not involve meeting anybody else.
And separately, thirdly, the issue of honesty, by all means bring it up too. Whether the action is aggravated because it was hidden (and hence would it be more acceptable if in the future it wasn't hidden?)
If they believe either or both of those or all three, fine, it is good that they make themselves clear and discuss it, but do not conflate the issues.
Or if none of those is really the issue and they simply do not want that to happen and want to claim ownership or right of exclusive use over their partner's sexual organs, fine, say so. But do not tell me that's an issue of honesty. That'd be more like saying "You to some extent belong to me, and use of your privates belong to me (because we're married or whatever, or because I was expecting that all this time), so please comply and do not contradict me or cross me and don't use them for something I wouldn't approve". That's how that would sound to me.
For me lack of honesty is if partner is doing something that affects me and not saying. It's not what my partner does with their private time or in their own mind or in the bathtub or meeting somebody or whatever, that's none of my business. My partner's a free person and deserves all the freedom they can get and I'm not going to stand in the way. Of course partner is expected to look after my health. Partner shouldn't engage in unprotected sex with me and another partner unless reasonably sure the other partner doesn't have STD's, and I'd do likewise (and this rules out prostitution). But honesty in that regard is being able to say, if something despite all due care doesn't go according to plan, "I took good care and attention and I had our wellbeing in mind as I did that (meaning health)". It is not to say "I didn't have any encounters". That's their business. All safe encounters are their business. What they do out of sight is always their business.
I wish most people saw it like that. And if people say, "I can't give too much freedom to my partner because he'd take advantage of it or misuse it or do something immoral or reckless, because he's immature or he's a jerk or he always gives in to his desires or whatever", then why did they marry someone like that? Or why stay married or stay together? It seems porn isn't the issue here, but their choice of partner. Porn is only a symptom. And you should address causes not symptoms. Symptoms only admit palliative care.