This was the first research study in Canada to explore intimacy boundary violations and sexual misconduct between nurses (both RNs and registered psychiatric nurses) and patients. Using a researcher-generated survey, a total of 923 mental health nurses commented on their sexual attraction to patients, and dating and sexual intercourse patterns with patients. The findings indicated that very few nurses had dated or engaged in sexual intercourse with discharged patients, and the few nurses who had done so tended to be younger men prepared at the registered psychiatric nursing diploma level. A small number of nurses believed it was permissible to have a sexual relationship with a patient while the patient was hospitalized, but none reported having a current relationship. Given the severity of this intimacy boundary violation, nurses need to be educated regarding the serious and dangerous psychiatric effects that can result for patients from engaging in a sexual relationship with nurses. The Code of Ethics of the Canadian Nurses Association and nurses' obligation to follow it needs to be reinforced. Nurses engaging in intimacy boundary violations are vulnerable to patient-initiated lawsuits.