Small-breasted blonde Sirena Irwin played mother to SpongeBob on SpongeBob SquarePants, and her voice has also added a sexy tone to the adult cartoon Stripperella. But if you want to whack off to Sirena then you’ll have to watch her in the flesh. Though she’s not exactly skinful in the short Whacked (2004), her be-thonged ass getting whacked is a thing of beauty.