I tend to agree - but for the purposes of defining "cheating" - I think that "cheating" and "right or wrong in God's eyes" need to be treated as separate things.
Cheating is breaking the understood rules within a relationship. While not quite the same thing - let's say we're having a race. We agree that in this race walking is ok, skipping is ok, but running is not ok. You skip your leg of the race, then out of sight I run mine. Within the context of that race, I've cheated because I broke the agreed upon rule.
But there's nothing wrong with "running". God doesn't look down and go "Wow, he ran, now there's a sin if I ever saw one." Maybe He might look down and frown upon your dishonesty - but the running itself isn't an issue.
So the rightness or wrongness of an action is separate and apart from "cheating" (not behaving in accordance with what's agreed upon/expected within whatever relationship it may be). Same goes true with this. While I think it's immoral to be a swinger - you're not CHEATING on your partner when you do it if that's what's been agreed to. They know what you're doing - they're cool with it - it's not outside the bounds of their expectations.
How God feels about it is another issue entirely.
Like I said - I totally understand the DESIRE to try and lump things like inappropriate content into the cheating category. People feel very strongly about it - and the more negative labels they can attach to it the better it makes them feel. But, for the sake of clarity, I think it's a mistake to do so.
Because like I said in the earlier post - then you're kind of removing the individual expectations from the equation altogether and making it about cheating God instead of cheating your partner. And what if your partner has insecurities that aren't covered by the Bible? I saw you liked my post about how hugging could be construed as cheating in a relationship if a partner felt it was. That's not Biblical. Nowhere does God say that. That would be a condition set by the individual within the relationship.
And if cheating isn't set by THEM - what's to prevent the spouse/partner from saying "It's God's will that matters, not yours."? I mean - that's the territory you've now entered into in order to try and chuck the inappropriate content stuff into the "Cheating" basket.
That's why I'm happy to say "cheating" is on an individual level - determined by the participants - because it allows for the "no hugger" person to assert their position strongly. It also in no way diminishes the ability for us to also say "Swinging is wrong" either.