Name a situation in which the rules have been clearly violated? That is what are the things " nice girls " just don't do

A situation where the rules have been violated would have to be the issue between tiger woods and his wife. Cheating is somthing that clearly violates everything which is personal and is kept a secret between one another there should be a boundry that is set between one another and this is an example of what nice girls and nice boys just don't do.