Answer- D. Habitual passive agentLateral traction test is done in unnatural sexual offences in habitual passive agent.The useful guide as to the patient's habituation to anal intercourse is lateral buttock traction test.In lateral buttock traction test, the thumb is placed on the cheeks of the buttock on either side of the anus and gentle lateral traction is applied.In patients who are not accustomed to anal penetration (penile or instrumental or any other) the traction results in reflex constriction of anal sphincter.The patients, who are used to anal penetration, react to the lateral traction test by relaxation of the sphincter.