The option to skip the scene (summary) only occurs if something relevant happens in that scene. And even then, some exceptions apply so that the player is not like: "wtf just happened?" Because there are quests that in the course of the quest, something happens that you can have disabled.
Also, what you already said happens: When the bum-fun appears on the scene, you can say it's not your thing, and the quest is completed.
If pee isn't your thing, you say "eewww" and it's disabled when the occasion arises.
Same with feet, etc.
There are some exceptions such as things related to soft domination, because although it is a fetish, it is not included as a fetish as such ingame, so there will always be a warning in case it happens.
And no, I'm not going to add alternative scenes depending on what you have disabled, as it would break the line of that quest/task.
With this, I do the opposite: Depending on what you have enabled, I add extra stuff, for the enjoyers. At the end of the day, skipping things doesn't break anything since that quest/task is meant for a specific fetish and nothing else, there's nothing relevant there normally (I try to take care of it). But I always add the option to see the scene just in case.