Gut feelings are your defense strategy - as I learned through repeated mistakes! It is as if my psyche, my body, and my aura can all sense if something's the matter. And, of course, when I word it all out the planet launches criticism at me. This world is a pushy place. There's always pressure to move on --- there is constant requirement to disregard past experiences, gut feelings, and fears and move on --- and this pressure pushes people (ladies in particular) to take a crazy step or disarm their defenses.
If a certain character appears shady, then it is shady! If something doesn't seem right, then chances are it isn't right. Stop right there.