To keep girls like Nelly from touching themselves, you have to locked them in a chastity belt. Then, because they are very impatient and frustrated, they start tugging at the locks and prying at the secondary shield. So you have to lock them in the Iron Crown to keep their hands away from the belt. But then they start protesting and moaning all day, so you have to gag them. Don't they just realise they are making things harder and harder for themselves!