I guess you have to trust your stomach on that one. I've noticed the difference.. Some guys just give off this.. not even a bad vibe but.. I just don't feel safe around them. And other guys (yeap, still talking about that last gentleman) I mean.. He led me to a pub in a part of the city I had never been to. He could have taken me anywhere and whatnot. And I didn't, for one moment, feel unsafe.