Thanks for the question. NTR is kind of a nebulous term that can mean different things to different people, so I'll just tell you what's in my game, and you can decide for yourself.
First, if you haven't seen or heard anything about my game, I should tell you right off the bat, there are two prostitutes in it. Pretty common for the setting the game takes place in and made it easy for me to realistically introduce sex into the game early on. One of those two prostitutes can be avoided by making the appropriate choices, but the other you cannot.
I should also point out, one of the LIs is a married woman.
Second, as far as sharing is concerned, there will be (most likely, not definite yet) a sharing scene later in the game. This will be with one LI on one path and the only sharing scene in the game. You will have the choice to accept the sharing or reject it. And just to be clear, by reject, I mean it doesn't happen.
Lastly, you will not at any time in the game see any of the women have sex with any man other than the MC.
Hope that answers your question. But if you have any other questions let me know.