Why Flirty? Why Dirty? Why Both?

From the inexorable dictionary.com:

Flirt:

(some verbs)

1. To court triflingly or act amorously without serious intention; play at love; coquet.

2. To trifle or toy with, as an idea.

3. To move with a jerk or jerks; dart about.

4. To move quickly.

(some nouns)

1. A seductive woman

2. One who flirts

Some etymology:

"The noun is first attested 1549, with the meaning, "stroke of wit."

"...flirt had come to mean "a pert young hussey" [Johnson] by 1562..."

Dirty:

(Selected meanings)

1. Soiled, as with dirt.

2. Apt to soil with dirt or grime.

3. Scandalous

Put 'em all together and you have a sometimes silly, sometimes scandalous woman who moves quickly from place to place, from idea to idea, who might often be found covered with leftover trail dust. Et voilà-- c'est moi!