There was two scenes reworked, the scene in the elevator (which is unavoidable, it is changed slightly but is still sexual assault, Adrian never has sex with her then). The second scene was the scene in the kitchen after she gets up to go to the toilet. Originally that scene was Adrian broke in and knocked her out with chloroform and raped her over the kitchen table, even though the police officer is outside. It happened the day you find out about Adrian and the GF can remember the events from before so would have remembered that Adrian had sexually assaulted her, so his story wouldn't have washed, but he wanted to keep that scene.
At the party the only way Adrian and the construction worker have sex with her is through your actions, if you ignore the GF during the party and allow her to be moved on by Adrian she will have sex with him, you have ignored her even though you are her BF, and then make her have sex with the butterfly mask girl as well. She has to have had sex with Adrian, yourself as you need to have sex with her as well and the butterfly mask, she will then have sex with the construction worker if you leave her to go to the hospital with the sister. All NTR scenes after the party are due to you effectively ignoring the GF, the most obvious is abandoning her to go with the sister and sleeping with the girl in the house for the foursome. All of those are considered jerk moves, and are not really gentleman route, but you can get the gentleman ending. There is also a setting to turn off ntr and as such you can be an ass and not get NTR.
The Boss one, you choose to leave the light on, he is effectively blackmailing her saying that the MC will go to prison due to the bosses fraud unless he hides it, he will only do that if she sleeps with him, so that to me it is still rape.