Micropilot,
That goes back to an event many many years ago.
I was filling up my welding truck at the time. She had a hot rod small block under the hood. She scooted big time. But she needed a little premium along with her regular or she'd ping.
When I was paying for the fuel I casually mentioned that "she" sure liked her premium.
The two forty something ladies working at the counter were characters. One of them peaked out at the truck and asked me why I thought "she" was a girl?
I looked out at the truck, shook my head, and said, "you ever see a butt like that on a boy?"