My feeling is that there are more non-NTR games with NTR tag on the forum. The problem is that many people consider any content where more than just the MC has sex as NTR.
I look disdainfully at the netorare tag in the HornyCraft thread and bunch of games with this tag where the MC is the wife / girlfriend cheating on the guy. Anyway, what I'm getting at: you're more likely to find false NTR tags on the forum than games with NTR without a NTR tag.
On the other hand, if you think only the MC should have a dick, then do so:
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