I think the reason guys aren't leaving the stalls and calling the cops isn't because they have an excess of testicular fortitude--it's because they didn't recognize the signal in the first place.
I'm content to let the debate play out in the comments. But a quick google search reveals no hits for "excess of testicular fortitude", so I'm using this post to stake a claim to it myself.
Because really. That's an evocative turn of phrase, you have to admit.