When my mother was newly married she lived on a farm 20 miles from the nearest neighbor. A salesman visted one day and my mother explained that she couldn't afford what he was selling. She mentioned that her husband worked in town every day, to help make payments on the farm. The next day her came back and tried to rape her. My Dad's dog, a usually docile german shepard, broke through a window and attacked the man. My Mom treated the dog like royalty for the rest of it's life.
Sorry, I don't want to make you paranoid, but please be careful. There are a lot of creeps in the world.