Eh... in photos they pass much more easily. Up close almost anyone can tell. Even the people who don't notice mentally. Usually notice SOMETHING isn't right.  Also, the voice is one of the hardest things for them to do properly. Also, the hands. Even a guy with small hands still has big hands for a girl.  Just a lotta little things at the very BEST that add up for most people. Any guy that tells you he got "tricked" is most likely full of shit.