I mostly agree with what you're saying. That series of events was written by someone outside Star and Tristim. I've never liked them all that much, and I wish NTR was more integrated with the gameplay. I'm pretty sure they're off by default thoughWell techically i dont dislike NTR, what i dont like is total randomness of it. MC should have influence guide and distract it and ofcouse if MC makes bad decisions or intended coal is NTR then there is that outcome. But having like random event for it is annoying. There should be kind of system like Mom starts to date someone and if she reaches certain number of Date she will get railed. Higher level of slutiness mean lower amount of dates, but MC could distract it many ways. Maybe sleeping pills for mom or decrease libido or asking her to date, or if you know who she dates try to find a way to put some impo pills on him.
Or you like NTR, before she goes to date add some libido or sluttioness pills on her drink. Total randomness is never good.