As said at the beginning, those scenes are going to be side events, it is not the main plot, but you have to trigger them, making some decisions, anyway I think this is clear nowAs someone who was going to avoid this game, I'm now somewhat confused.
Your previous posts seemed to be saying that there were going to be sharing/NTR/whatever scenes that were full stop going to happen, and at most the player could just choose to not view them.
This post seems to indicate scenes involving other guys only happen if the player chooses not to pursue a relationship with a female character. This would be decidedly different than the first scenario, and if it is the case you should probably be pretty clear about it and lead with it when asked about the subject, rather than saying it's a side-event or doesn't have to be viewed.
The first may or may not be NTR, depending on the exact definition applied (Even VNDB changed their definition recently, and different sites often have different definitions) and how it's actually executed in-game, but it would absolutely be something some people wouldn't enjoy. The second definitely wouldn't be NTR and would be a lot less objectionable (I.E., probably not an issue at all) for most of those who dislike sharing/NTR/etc.
I hope you enjoy the game if you decide to play.