I stop at all the lights, usually using the prostitutes and transvestites to lean on when they come over and start going through my panniers. I always avoid eye contact and pretend like they don't exist because obviously that is the solution. If they continue, I tell them I'm going to call the police on them! That usually scares them, or at least I think its fear when they stab me several times and I die at the intersection waiting for the red light to turn green.
Then I wake up and realize the streets are a dangerous place and I remember to continue riding according to what has kept me alive in "one of the most dangerous places in the world."