Why tho? You give no elaboration other than pointing to the Ten Commandments, which I find absolutely reinforces the OP.
absent of religion, why is adultery bad? Why is it bad to take care of yourself? Why must your mental health suffer because religion has permeated societal norms?
Wait, out of ALL the the commandments, adultery is the worst?
@Daemon Sophic even worse than murder?
I'm agnostic, but I simply used the Christian 10 Commandments as a fairly well known set, that when ranked, most take your response of "WHAT!? Worse than Murder?"
- You shall have no other gods before Me -- No. I'm agnostic. You present yourself with evidence relativistically significant to your claim; along with the down-sides of all of the other gods (which you have clearly acknowledged do exist), and maybe we can talk.
- You shall not make idols -- Meh. See above.
- You shall not take the name of the LORD your God in vain -- God damn! That sucks. Oops I did it again.
- Remember the Sabbath day, to keep it holy -- See 1 & 2 above, so ..... whatever.
- Honor your father and your mother -- While I personally do; there are MANY ****ty parents out there, who deserve punishment and pain. Not honor.
- You shall not murder -- In defense; of myself, my family and friends, or the innocent. No problem killing. If you want to knit-pick as to whether that's "Murder" or not, I believe goes against the overall thrust of what Christianity is claiming. But I'm sure I could see to "Murder" in the pre-meditated form, if I know that the soon-to-be-dead was pre-meditating harm to me and mine.
- You shall not steal -- If it keeps us alive. So be it.
- You shall not bear false witness against your neighbor -- Yeah. This one is a bit dishonorable; lying shouldn't be done lightly. BUT it might be necessary in some scenarios.
- You shall not covet thy neighbor's wife/belongings/etc... -- Too bloody late. I see stuff that I think would be REAL nice for me. I'm coveting. Coveting and fantasizing about another person is part of human imagination and life; coveting and fantasizing about playing with cool gadgets that another person owns (jet-skis, or a boat, or a sports-car, riches, etc...) is fine and dandy.
- Now, taking action on that covetousness is a whole different story.
- You shall not commit adultery -- Why would you? Really.
If you lust for another, but you've already agreed with your spouse to stay together and monogamous for all the days of your life; why would you break your own word? Your spouse promised the same to you, and has held to it for (insert time-frame here). Yet you are so scheming and self-serving and deluded with self-importance (narcissistic) that you would break that trust (the literal foundation for almost all loving, long-term relationships), just so you can go get some action with another, and toss aside the person who has put their everything into their relationship with you for so long. To do that is the defining epitome of what an untrustworthy piece-of-**** backstabber is. And unlike murder or stealing, there is no situational defense. No need for health, or survival to explain why you just HAD to have a piece of that ***. No.
Heck, you could even break your relationship off with your spouse, just so that you can go chase that other skirt. Pathetic, but acceptable. But sneaking out, and lying to your spouse, the adulterer is the indefensible scum of the Earth.
Now. All that said. No, I've never been cheated upon, nor even had a loved one burned by an adulterer.
I've simply reviewed these most holy-of-holy rules in Christianity, and found 9 of the 10 to be worthless, depending upon one's situation. I cannot think of a situation wherein one could try to explain and excuse Adultery.
It's a matter of trust. Broken.
PS - Polyamory on the other hand, is an agreement (made ahead of time), with your spouse to allow for sexual relationships outside of your 1-on-1 connection. I personally am not Kosher with that, but that's just me.