But Allison Williams gave her raunchiest performance to date on Sundays episode of the HBO show as she stripped off for a sex scene . Allison Williams strips off for X-rated scene with Alex Karpovsky as she puts on a VERY raunchy display in Girls. Allison Williams strips off for X-rated scene with Alex Karpovsky as she puts on a VERY raunchy display in Girls. But Allison Williams gave her raunchiest . Actress Allison Williams has been playing the role of Marnie Michaels for the last five seasons of HBOs hit series, “Girls.” Now, in its final season, Williams talks .
