Photographing from a bathing machine - Kodak film wallet 1915

A close-up of the scene on this folder www.ipernity.com/doc/philsutters/49920738
I have just realized that the photographers on all these folders are women. I know that my mother's mother and her aunts all seemed to take it in turn behind the lens, so I wonder if the processors chose the folders accordingly, or was this an advertising ploy using attractive women to plug the product.