Had the exact same thing, moved on to other quests, then when I only had this one left, the nurse had a new dialog option that will start the Slutty Nurse. Not sure what triggers it actually, so just play the game more and it will appear at some point.The Slutty Nurse quest seems to be bugged for me, when talking with Courtney in the first aid station, I cant select 'I love your tits', it just blinks and nothing happens, so the quest doesnt start and I cant talk to her in the nightclub. Any ideas? Thanks!