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

You are polling us.... what is cheating to you?

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

Don't promise fidelity, if you cannot be faithful. Don't promise honesty if you cannot tell the truth.
Period.
Any attempt at qualifying or explaining is nothing but justification for being a lying asshole. It's not that hard.

I would consider it cheating whether I was told about it or not. Unless you tell your partner from the get go, "Hey, don't expect monogamy from me," it's a selfish and very mean thing to do. It's playing games with another person's head.

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

All sorts of descriptions, but from my viewpoint, cheating is when you lie, regardless of what you are doing, when you have to lie, you have cheated....

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

Cheating is about breaknng agreements. If you both agreed to be monogamous, then it is cheating. If you you have agreed otherwise it's not. There are many ways to cheat depending on what agreements are understood between the people involved.

As others have stated, cheating is breaking agreements within a relationship. If you agree to be monogamous and then pursue relationships outside of the one you're currently in, that's cheating. However, it's not cheating if you've both agreed that seeing other people is fine. Different folks have different levels of comfort when it comes to romantic endeavors which is why communication is key to avoiding any misunderstandings.

I'm not sure of the definition of "partner" if you're having other relationships. If you aren't exclusive, I don't know how there's cheating. Could be more about rubbing someone's face in the fact that they're not the only one.

I would always be truthful to her that's how we have stayed together 30yrs but we haven't had sex in 13/14yrs

If you're open about it -- and AGREE it's okay -- it's not cheating. Sounds like a form of polyamory to me.

Unless your partner approves of an open relationship then anything that violates the relationship is cheating. I think too often no one discusses it, we each have our idea of what the relationship is and we feel violated because we are following the rules we think are in place while our partner is operating under a different set of rules.

I think cheating is a matter of betrayal of trust.

You have a relationship that both parties knew was open, and both parties are happy to be open, then tell then the truth and you're not cheating - but honesty means nothing if your parner is expecting monogamy.

It's just like saying 'do I stop being a thief if I'm honest about the fact that I steal?'

It's betrayal of reasonable expectation that makes you a cheat - not whether you 'come clean'.

If everyone is open and upfront about their relationships, the answer is no.

I've been in several open relationships where the man had someone on the side without telling me. When you betray your partner's trust it doesn't matter what the status of your relationship is (open or closed); it's still cheating. What I fail to understand is why would they lie about something when they don't have to? Makes the betrayal worse if you ask me.

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.

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.

Cheating is when you don't tell, and lead your mate to believe you are being true. Being open and honest allows your mate to decide whether to accept the behavior or leave. Being dishonest takes away that choice and leaves the mate feeling duped and laughed at for their naivety.

If the relationship is open then it isn't cheating. Cheating is when you promise a commitment to a monogamous relationship (or some other limitations) and you break it. People who cheat will often keep secrets and lie about cheating. So it all boils down to taking advantage of a person's trust and breaking it. If they are open from the start about their other relationships, it's not cheating, but if you're with them for a year and they admit to having another relationship when you've been under the impression that the relationship was monogamous, that's cheating.

Open relationships have to be agreed upon by both parties, with clear boundaries established in advance.

As long as both agree and are participating, there's no cheating involved.

I never forgot an architect/photographer in Lexington, KY, who said he had divorced his wife for cheating on him, remarking, "If she'd told me she wanted an open relationship, it would have been fine, but she did it behind my back, and that betrayed my trust in her."

Later on, he gave me this speech;
"It's been years since I've been with a woman, or found someone interesting enough to want to be with the rest of my life, but you seem to be that person. We can just be dance partners, be friends with benefits, have an open relationship, or have a monogamous one, whatever you want."

I was floored and nearly cried..I'd never heard anything so wonderful in my life. I opted for monogamous friends with benefits, and we got together most weekends to dance the night away and more.

The heart wants what it wants. There’s no logic to these things. You meet someone and you fall in love and that’s that.

You rely too much on brain. The brain is the most overrated organ.

That's between the partners. If the other honestly does not care then no, but if they do then it will be cheating in their head.
To me, in my relationship, it would be cheating. If I knew or was told about it, I would be gone...

If you in an exclusive relationship with someone then, Yes, you would an honest cheater. If you are not in an exclusive relationship then, No, I would say you are not cheating.

Cheating is in the eye of the person being cheated on. If they know about it and condone it, it's not cheating.