If you mean the times the MC has sex with Aunt/Cousin/Grandma while Ava is controlling their minds, somewhere in the middle of the quest, those are optional scenes. And there's some explanation on them being aware of it and not minding it.I heard people saying the ghost Possession stuff, and the 2 rape scenes were unavoidable... I heard at best you can press skip but you can't make it not happen as in make its actually not be canon, from what I read there was really only a skip/don't watch button but its still happens/is canon?
If it is 100% avoidable/preventable how do you stop it from happening so many others are complaining about it happening anyway?
If you mean the time when Julia comes home with the vampire, then no. You definitely interrupt it and there's no sex behind the scenes. There are options where you won't see it, or options where you see it, but you have the option to make it not happen at all. Cannonically.
I personally don't like NTR. And Julia's scene feels like NTR because we know we will want to chase her. But at that point in the game (which is very early) she isn't a love interest yet. So even if you choose the option where she has sex with the vampire, it's still not NTR.
I would prefer if the option simply wasn't there in the first place, but at least you have a very clear way to stop it.