The extreme stuff wont be exclusive to the institute, but all institute questlines will be pretty hard hitting.
Btw, not sure if you are aware but there are multiple endings to the Haven quest, although you got the "worst" one.
And I am not afraid it cant be beaten. The ideas I have for the next major Haven sized mission will easily compete with the best (or worst) Haven has to offer.
But things did ramp up a bit quickly. There was supposed to be a few missions beforehand as a sort of training for Sammy, but there wasn't a huge amount of lewdness involved. I felt that was an area the game was lacking so I skipped over the security training missions and jumped straight to Haven. Once the training missions are in, there will be some foreshadowing so things don't feel so abrupt.