To go "between the legs" is to strike where the armor parts. In a fight, it is a low blow (illegal, but effective). In business, it is the hidden leverage point. In entertainment, it is the taboo you dare to film.
If this is from a specific niche community, a piece of underground art, a personal project, or an inside reference, I would need more context to generate an accurate or meaningful text. the voyeur 22 between the legs evil angel
"I seek to understand," she replied, her voice steady. "The line between observation and participation, between voyeurism and engagement with the world." To go "between the legs" is to strike where the armor parts