I knew a guy in my younger days - not real well, but my GF at the time told me he was real creep, a total sleazeball. His way of finding girlfriends: He would pretend to be an addict/alcoholic and comb the rehab centers and various AA/NA meetings he would find. He'd play the part real well; he was well practiced at it. He'd try to find or pinpoint those women and girls he would identify as more emotionally vulnerable and easier "prey," so to speak. Even worse was that he seemed oblivious to what he was doing, as in his mind, he apparently thought that he was "helping" them.
I had a creepy roommate for awhile... It was when I was living with my oldest son's father. A childhood friend of his had wound up homeless, and rather than have the guy sleep on the streets in the dead of winter, my ex said he could stay in the basement(it had an extra bed, couch, TV) until he got on his feet. He was fine, actually, at first. He was an alcoholic, but he kept it to himself. I remember he was very, very quiet. Sometimes he'd ask me for a ride here or there, and that was okay. I'd talk, he'd smile and nod, but other than that, there was almost no communication between us.
Until the day he wandered up from the basement and said he had to ask me something. I was in the middle of doing something, and I wasn't keen on the idea of giving him a ride somewhere at that moment, but I asked anyways, "I suppose you need a ride?" Well, I guess a ride he was looking for, but not the kind in the car... He made a very blunt request for sex, to which he was instantly turned down. I was home alone with him, and I got scared. I told him he needed to go. I was calling my ex, and he would see that he left.
His face turned red... he looked really ashamed. I don't know what he was thinking, asking that. My ex was abusive, and I don't know if him hearing me being berated and screamed at day after day made him think he had a shot... I was worried when I called my ex that he'd turn it around on me, but he didn't. He was as stunned as I was. He came home, made sure he left, and he was gone.