Walk like a woman

[Eryn]

I don't understand the "heels" thing because not all women wear high heels and those who do don't wear them all the time.

True, but 99% of those who wear heels are women so if a CDer adopts the modified gait of heels it gives a strong feminine visual (and often audio) cue to the observer.

How one handles one's arms while walking is also a strong cue. Some women hold the strap of their shoulder bag with one hand while the other is swinging and held slightly further away from the body to maintain balance. No man does that, so it is a feminine cue.