It is one of the most horrendous societal norm violations that one can commit within a relationship, yet what is the secular, reasonable argument about why cheating is wrong?
In other cultures, it is perfectly acceptable. I heard about one (Japan, was it?) that finds it acceptable to have the physical act of sex with someone to "get it out of your mind," so to speak, as long as you are still intimite with and love your wife.
What's your secular argument for why infidelity is wrong? What if it was with permission and therefore not dishonest?
What about polygomy?
I actually truly have a neutral opinion because I have never heard the reasonable argument for or against. I'd like some secular input. The only arguments I ever hear are theist.