Onkel bumst Nichte + Inzest am Badesee2007, Dir. David Veronesi (David Veronesi & Francesco Santi (cover) Paradise Film (Studio Pervers) 54009, Germany
The German version (still with Italian soundtrack) attempts to justify its titular plus-sign by the addition of four further scenes and the expanded female cover-credits: 'Jessica Ross, Crystal, Laura, Carolina, Maya, Mishelle Morau, Emma Stark'. See also this thread.