Here's 'Polyamory': Multi-Partner Sexual-Rights Crusade on the Horizon

It was only a few months ago that someone last treated Cassie Johns like a freak.

During a doctor’s office visit in February, she was asked to list her emergency contacts. Johns, a preschool teacher in Seattle, wrote down two people -- Chris and Joan -- and identified both as her “partners.” They are two of the four romantic interests Johns has been involved with for many years.

“‘Oh, that’s so dirty,’” Johns recalled the receptionist saying. “And the receptionist literally stepped back from me, in a doctor’s office.”

Johns,...