She lets out a bark of laughter, and shakes her head. "You have two choices, for teenagers will always try to sneak off for a tryst, either in the Tower or the dungeons where it's quiet. You can lose sleep over it and become paranoid about catching them, like Filch, or you can just ignore it and clean up the Tower every morning just in case."

A pause, as she takes another bite of food, and she adds, "If it's any comfort, I have students brew a contraceptive potion in the first semester of their fifth year."