This is a time-honored evangelical tradition which Christian culture is loath to speak of, yet everyone who grew up in Christian culture knows youth pastors (plural) who were deposed due to the dubiously defined Moral Failure. And those are just the ones who were caught.
The youth pastor’s fall from grace is never less than gory. Once found out he will either make a tearful public confession, feebly defend his shredded reputation, or both. He is then ceremoniously fired and flees town under a spectacular shower of emotional fallout while the abandoned youth group reels from this strange new trauma which Christian culture has no idea how to handle. In their heads they replay the years of Purity Talks he gave whilst conducting clandestine activities on the side.
Post-scandal, these pastors sometimes go on to be youth pastors in other churches. This usually happens even with the hiring church’s full knowledge of his past. Youth pastor gets older, high school girls stay the same age.