Which standard from the NASW Code of Ethics has been violated by the social worker in this? Describe the specific behavior that violates this standard and how the social worker should have acted to comply with the relevant ethical standard.

Calla meets her former social worker in a local bar and says, "Hey big guy. I've been bad. Want to come back to my place to spank me?" Her social worker says, "Of course. My primary duty is to serve my clients."