not escort related at all, but when I was about 22, in the first place I lived after moving out on my own, I'd given a friend a key to use so he could use the weights & other exercise equipment in the basement. After a bit, I came to realize I didn't like coming home from work and finding someone else in my house, so I asked him for the key back. He demurred and said he could give it back to me tomorrow. The only reason I could think of for him doing that was so he could make a duplicate. (He clearly had the key with him since I'd come home and he was there.) I've never really trusted him since then.