#2. Sex Sells
If there is one universal truth, it is that human beings do dumb things when attracted to someone else. Now I am sorry to disappoint you, but writing about how to social engineer someone to be attracted to you is an entirely different topic for an entirely different audience. In the context of this article, however, using human attraction is about getting someone interested in you and giving them the impression that the feelings are reciprocated. This leaves the person vulnerable for you to do everything from gathering insider information to pick-pocketing keys to a building while he or she is not paying attention.
A social engineer is one who understands psychology and engineers ways to manipulate people to their advantage. Leading someone on to believe there is mutual chemistry is one of the oldest social engineering tricks in the world.