Etiquette is a code of social behavior generally accepted by a society, a social class, or a group.
Photographers constitute a group and, as such, have additional codes of acceptable behaviors. It includes many of the same ideas about acceptable social behaviors as put forth by society at large -- although it's not always evident when reading through more than a few photography forum threads -- and also includes a few unique codes, i.e., unique to photographers.
Glamour photographers are, of course, a smaller group within the group known as photographers. Glamour photographers, like all groups, have a few more codes of behavior that are considered acceptable by the overall group. Much like the acceptable behaviors of many groups, codes of etiquette amongst photographers, glam shooters or otherwise, are not strictly adhered to by everyone. READ MORE?
(Note: Link contains NSFW pic.)