You ignored my point. To unblock progress and MOST of the renders, dialoges and scenes you need to increase corruption. Saying that not playing the game like you suppose to make content optional is insincere.Or you could just raise the girls' favor, love and lust and then invite them over at night or ask them to skip class with you. Plenty of sex and no need for mindcontrol, bimbofication or public whoring.
I don't dislike the game. I would enjoy it more if girls were more diverse in their corruption (some become whores, some not - not every corrupted girl lose all shame and selfrespect), but Baal evidently don't want that in his game. Which is his choice.
However I don't like this "optional" excuse which devs commonly use to dismiss criticism. If you can't enjoy most of the content without looking at something it is not optional.
Technically you could even complete Fallout New Vegas without killing anybody, but advertising this game by saying that killing is optional would be ridculous and quickly become international meme.