A soldier thought he was in for a night of sexual adventure when he let a Perth teenager handcuff him but was instead assaulted by the girl who believed he had wronged her, a court was told.

Nicola Clunies-Ross went on trial in the West Australian District Court today accused of luring her Darwin-based soldier lover to her East Perth home on October 28, 2006, when they were both 19, and tricking him into being restrained.

She has pleaded not guilty to assault occasioning bodily harm, aggravated sexual penetration without consent and deprivation of liberty.