NO ONE will pass 100% of the time.
I once dated a GG who was 6'1" and she told me that there have been times where people have asked her if she was TS (she wasn't). Which by the way is why you don't ask that question - think about how that girl will feel if the answer is "no," but I digress.
On the other hand, I would also wager that most folks are not as hyper vigilant and don't pay nearly as much attention or have nearly as high standards as someone who thinks that only 1 in 1000 girls pass. I would bet that the OP might be the type to assume that my girlfriend was a guy.
Will everyone pass all the time? Of course not. But with sufficient practice, and work, most of us can pass most of the time. But there will always be that one jerk who has to ruin it.
