All that complicated logic should in theory apply to all those relationships as well, but it does not.

It does though.

Your friends could say they don’t like your partner.

Your partner could say they don’t like your friends.

Your partner could love or hate the idea of you fucking one of your friends, etc.

When you involve sex and/or deep commitment as a partner, like, a life partner… emotions and condiserations get more complex and of greater magnitude.

So… the more people you are partnered with, the more people there are with strong and complex emotional considerations going all ways.

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But anyway, none of this addresses my original critique:

You have not demonstrated that broadly, monogamous relationships are unethical, de facto, 100% of the time.

I don’t think nonmonogamy nor monogamy are inherently, de facto, all the time unethical.

I just think that nonmonogamy is more difficult to do ethically.

You said monogamy is unethical.

Do you still hold this view?

If so, why, for what reasons?