Cameron’s nude past helped promote show
Four years before starring in this series, Joanna Cameron performed nude in the 1971 movie B.S. I Love You.
After Isis became popular, photos of her nude scenes and nude photos she posed for as a model before she started acting started popping up in men's magazines along side images of her dressed as Isis.
Reportedly, that caused teen and adult males (and no doubt lesbians) to seek out the series which helped increase viewers.