A girl in that dresses like a hooker and has 3-d sex for money.
Sometimes involving text chat, voice calls, and webcams all depending on the price. Additional 3-d furniture and toys are used to enhance the pleasure.
Common games that offer Pixel Sluts.
secondlife and redlightcenter
"That girl is a total pixel slut don't even try to hook up with her unless your willing to pay for it."
"Who you callin' a Pixel Slut."