If you are a straight male just try and go into a female restroom and have a look see! Or conversely try to go into a male restroom and stare at the opposite sex. On the other hand just claim to be a transgender and all doors are open. Perhaps next time you wish to experience that latent voyeurism, just boldly stroll into that no so private facility and if arrested by the local constabulary just announce you are a transgender and are entitled to use the restroom of your choice. Believe me you will not be subjected to a full body search!