2. Meg Griffin.
2. "Meg, you can't be abstinant. You are what the guys call a practice girl."-Peter Griffin
Practice girls don't have much social pull, nor does their pleasure matter, so they are perfect specimens for teenage boys to use to "step up" their sexual ability when they practice sex with a better/more attractive girl.
Guy B: "Oh dude, just go fuck emily tonight.... she'll be at the party"
Guy A: "No way dude, she's a fat fuck"
Guy B: "So fucking what pussy? She just a practice girl, she doesn't matter"
Guy A: "Niiiiiice"