Why on all earth would you want to have "other" relationships when you are with someone?

well it depends are you throwing it in their face if you are then yes if not and you're being honest with the relationships you're having then I would say no but this has to be agreed upon by both partners at the start of the relationship otherwise this will lead to resentment and jealousy

I was in an open relationship with my then wife, and took advantage of that. When I have been in closed relations I was all about them and not side line activity. Depends on the relationship and understanding with the people involved.

So many experts!

It would depend on what basis you entered or maintain the relationship- if you promised fidelity, its cheating, whether you disclose it or not.

By definition, I would think that if you are in an agreed upon open relationship, the word cheating does not apply. If you are cheating, then you are withholding information from your partner and hiding your affair as much as possible. It’s kind of like going into a store and they have a rack of merchandise marked “Free” and the next shelf has priced items. If you take a free item it is not shoplifting. If you take the priced item, you are. Best example I could come up with quickly! ?

I wouldn't be so upset that they went off to have sex with someone else as I would be that they didn't invite me along for a threesome

I can’t promise I’ve read through every comment here but I don’t think I saw the word consent anywhere. Did you make an agreement to be monogamous? If you have another non-monogamous relationship without first obtaining consent from your partner then it is cheating. You can’t just break the agreement and then by describing it after the fact unilaterally decide that it’s ok. If you have carefully discussed all the parameters of how and when your relationship will be open and you are operating within the agreement, then no problem. Some partners agree to allow side dalliances as long as they never find out about it. So telling about the relationships is not a universal “fix” either. You have to come to agreements ahead of time about what each partner needs and wants.

Easy lay up here. FUCK YES...IF...you just tell them. If you discuss it and open your relationship together then it CAN'T be cheating. easy.

It's not cheating if everyone knows the rules. Not liking the rules does not mean your partner is cheating.

It sounds wordy and strange. But I think the questions relates to an open relationship. Well, you have to be sure that the open relationship is really open and not just your dream. If the second partner kinda agrees but hired a hacker to track you, maybe you've chosen the wrong person for an open relationship. On the other hand, if you both agree on an open relationship, then the word cheating makes no sense. I think this word is eligible only for monogamous relationships. Otherwise, people are free to date anyone they like to. Antracit, did I ask your question? You just had to go through the previous comments.

I think in any relationship that has any chance at all it's necessary to be clear about and in agreement about the parameters. What can you do with who? To my mind, if you are violating your agreement, you're cheating. But if you have agreed to an 'open' relationship then I would not define it as cheating. I will say that I have known a number of people who tried open marriages and none of them worked out. Of course my monogamous marraiges didn't work out, either, but for very different reasons.