I wouldn't call it intolerable, most guys just don't like it when girls they're with put another man's junk in their mouths, horse or not.
Also, I see no relationship between what you're saying and what I'm saying. Why do you think I suspect previous experience, even small amounts, makes them a ruined slut? Seems like a strawman to me.
On to your point, there should be a harem sharing tag or cheating tag of some kind at the very minimum. And no, cheating does not require it to be done in secret. Definition of cheating in this context is
"be sexually unfaithful." So yes, it would definitely fit here.
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