Some people enjoy more discretion. If that's you or your visitors then consider adding the discretion panel. This is a panel this is sewn in below the hole and zipped in place above the hole. The panel has a wave cut slot down it's centre which essentially turns the gloryhole hole into a more discreet slit. 
 
You don't need this feature to ensure anonymity. Personally we prefer the unrestricted access to the crotch that the hole provides but we had a lot of requests for this feature so it's here for those who want it!