Except it isn't. Don't be a coward and pretend you're living up to the standard you set when you started the relationship. Talk about it with them and reach an agreement, whether it's to stay together or things won't work out. There's nothing good about being ball-less and going behind someone's back to cheat because you're too afraid to talk to them about it. People have open relationships, whether it's socially acceptable in your mind or not is a completely different topic than someone cheating on their SO after agreeing to a monogamous relationship.
Who said I ever disagreed with making an agreement at the beginning? You seem to be reading way more into things than what's actually there.
Again, someone using an observation about non-monogamy vs. monogamy to defend their lying does not change whether that observation is true or not.
Then be the one to talk about it?
I am! And if you want more people to be able to talk about it, creating a society that's more accepting of non-monogamy is the way to go about it, not just raging at cheaters. That's valid to do as well, and can provide a relief, but it doesn't actually solve the problem we're both supposedly interested in solving.
The other thing is, yes it should be implicit when the vast majority believe in monogamous relationships.
And the vast majority believe heterosexuality is the only right way of doing things. Doesn't mean that that mindset shouldn't be debated/challenged sometimes.
Again, this doesn't mean "oh no, cheaters will have free reign now to justify their behavior!" anymore than challenging heteronormativity means "oh no, our children will all be gay now!"
The vast majority believe in that so that is expected, I don't see how it's wrong going under the assumption especially if you don't agree with that and feel it's not noteworthy to mention.
Again, I'm not speaking in support of "cheating and rationalizing after the fact". I even added that disclaimer in the post you were responding to!
If you want to go that route than just as much burden is on you that you were incapable of mentioning something that you know if important for you in a relationship. I don't know why people keep trying to throw people who believe in monogamous relationships under the bus and they should just "deal" with people cheating on them.
Who's "throwing monogamous people under the bus"? Sure, we may be challenging your dominant positions a bit, but that's not the same as "throwing monogamous people under the bus". To rephrase a point made earlier: mentioning that gay people exist alongside straight people, and that straight people aren't the only valid sexual orientation is not the same thing as "throwing straight people under the bus"
Again,
I am not defending lying to your partner(s). All I'm saying is that stating "CHEATING IS BAD GRRR", doesn't actually solve the issue of sexual infidelity. Just like "DON'T HAVE SEX UNTIL YOU'RE MARRIED GRRR", doesn't actually solve the issue of teen pregnancy. We've been saying "CHEATING IS BAD GRRR" for the longest time, and people still do it. There are religious commandments against it, and people still do it. Some countries have had death penalties for it...and people still do it. So maybe, there's something else behind it that should be discussed?
If we're actually interested in people being more open and honest with each other when it comes to this topic, that should involve a more realistic assessment of human sexuality ASAP.
This is not the same thing as saying "here's your get out of jail free card, cheaters! Just say monogamy isn't natural and boom! Fuck as many people behind their back as you want!"
edit: I guess part of the miscommunication here is that some seem to look at "cheating" as a bunch of isolated cases in a vacuum, while I tend to look at it more from a societal standpoint. Sure, if I happen to be talking to a specific couple dealing with the issue, I won't go into a big generalized non-monogamy vs. monogamy discussion. Just like if I was talking to some murder victim's family, I won't go into a big sociological discussion of poverty, mental illness, and lack of parenting (even though those are obviously relevant factors when it comes to crime)
But if I'm posting on GAF for a general audience, in response to a general and open-ended "why do people cheat? How could we prevent this?" discussion, then I'm going to get more general with the points I raise.