Sexo com Amor?

After watching the Brazilian remake "Sexo Com Amor", I was surprised with the lack of credit to Chilean "Sexo Con Amor" (2003) from Boris Quercia. The original story is retold with minor modifications in the screenplay, but no credit to the author (a.k.a. plagiarism). See http://www.imdb.com/title/tt0363292/.

Rene Belmonte seems to be specialist in rewriting other screenplays without giving the credit to the original author. The same plagiarism happens with the Mexican "Sexo, Pudor y Lágrimas" (1999) from Antonio Serrano (http://www.imdb.com/title/tt0164877/) and the Brazilian "Sexo, Amor e Traição" (2004) (http://www.imdb.com/title/tt0376873/). My vote is four.

Title (Brazil): "Sexo Com Amor?" ("Sex With Love?")