At least at Playboy Clubs in 1969.
Bunnies are forbidden to date other employees of the Club. Violation of this rule is cause for immediate termination…Any Bunny who arranges to meet or be met by a keyholder, guest or employee of the Club (either on or off the Club premises) will be dismissed immediately. If a Bunny is asked for a date by a patron, she should advise him, in as polite a manner as possible, that Bunnies are not permitted to date people they meet at the Club. She is also not permitted to give her last name, home address or phone number.