Coquettish glances and flirtatious smiles — they’re often good indicators that a lady is hot-to-trot for what a guy’s got —- but these cutesy cues are only the tip of the iceberg.

Singer Katy Perry has begun her career-spanning "Lifetimes Tour" where she'll perform hits from across her discography. So far, it has been met with mixed reviews from fans, with some people on social ...