Lost in translation

I just spent the last hour-ish watching an American movie dubbed, which is slightly frustrating as both the dubbing and the subtitles were foreign to me. However, it was literally a half ass-ed dubbing job as the language would switch mid sentence back to English and it seemed this always happened when the characters were talking about sex or relationships. As the movie was a serial killer mystery, this small bit of English here and there did little to help me follow along.