That's exactly why social engineering works: biases and assumptions. People are absolutely generally more willing to help a woman than a man for a variety of re

That's exactly why social engineering works: biases and assumptions. People are absolutely generally more willing to help a woman than a man for a variety of reasons (perception of harmlessness as you point out; people assuming women are incompetent; guys wanting to help to increase sex appeal; etc). Men can exploit different social vectors (eg large, imposing men being demanding or aggressive will get obeyed more than other people because we automatically associate size with authority). It's not the pentester's job to fix social policy, merely to point out that threats can come from a variety of vectors that people don't expect.