Instead of "whip it out", why not "zip it out"?

More videos Instead of "whip it out", why not "zip it out"?

Whip it out
Whip it out
You gotta whip it out
Just whip it out
How I whip it out.
Sunny day? Whip it out!
Whip it out at work..
"I Just Want To Touch Them Once!" I Drug My Voluptuous And Busty Teacher With Sleeping Pills, Enjoy Her Curvaceous Body And Creampie Her Repeatedly! 3
I couldn’t not whip it out
Whip it out!
Whip it out
Gotta whip it out
Whip it out
Whip it out then stroke it out