I saw a guy in a door to door sales uniform watching my 15 year old sister sunbathe.

This happened last week at my parents house in PA. We have a little patio area where my sister likes to sunbathe. I was in the kitchen making lunch and saw a guy in a door to door sales uniform walking up and down the street. He had one of those little briefcase things that door to door salespeople always have. He made his way down the street and stopped in front of our house, but didn't knock on the door. I couldn't see him from where I was but I could see my sister on the patio.<br><br>I went outside to ask my sister what she was doing (I made her lunch and she had been out there for a while) and saw the guy standing at the corner of our house kind of crouched down and looking over into our backyard. I don't want to accuse anyone of anything, but this guy was 100% looking at my sister. He was probably 35-40 years old, no idea what he was selling. I yelled at him to get his attention and he made his way to the door.<br><br>I asked him what he was selling and he told me he was selling those alarm systems, but he didn't have any sort of ID or anything for me to verify that he worked for the company. I told him we weren't interested and left it at that. He walked down the street and stopped at a few houses but I didn't see him go into any of them.<br><br>I told my sister what had happened and she said she noticed a guy walking around but didn't think much of it. Definitely made me feel like a big brother haha.