Is this photograph part of a larger set?

[Potsdamer Platz]

This is one of my favourite photographs of a chick on the toilet. I have a feeling though that it is part of a larger set (perhaps Photobucket or Webshots) - my reason for thinking this is that I seen another photo of other girls messing around in a bathroom and the same book "THE GUINNESS BOOK OF RECORDS" silver edition, was lying next to the toilet. I'm not sure but it was probably the same bathroom.

Can anyone help with tracking down more photographs from the set?

Any help would be appreciated