"Everybody lies". Even if the majority of people's history and proclivities are considered "vanilla", those individuals themselves don't want that information b

"Everybody lies". Even if the majority of people's history and proclivities are considered "vanilla", those individuals themselves don't want that information being made public, would likely feel some sense of shame if the information got out, and want to avoid any situation where they would be judged or teased. Even if that content is considered relatively tame by a tolerant society.