There is forced NTR with the initial love interest in the pseudo-prologue. After that you are free to pick a love interest in the main story and that's when the NTR game mechanics begin. Those are avoidable, and with one exception late game I think they're a little too easy to avoid if anything. The exception to this is if you romance a dwarf character, there is one NTR event there is no way to avoid currently. You can still get a happy ending with her though, and the forced NTR scene with her will be avoidable in a later patch.