When you 'Close the Curtains' you are actually preparing to masturbate. You close the curtains to allow peace of mind that no one is looking at you pleasuring yourself with eyes closed in lust.
Masturbation Lust Curtains
*Someone comes in the door*
"Kim, why are the curtains closed on such a nice day?"
"Umm, I was closing the curtains to test their effectiveness"
"Okay Kim, okay"
By Shirline
Close The Curtain
To turn up the volume on the tv, refering to volume signal that pops up on the screen that slides to the right. Opposite to open the curtain witch is to turn down the tv