Can someone help me find a movie...?

Hello guys,

Sorry about posting on this message board about something not related to Heartbeats... But I'm desperate. I can't remember the title of a movie I watched on netflix a really long time ago. It was French and it was about this group of friends who all kind of have sex together, even though two of them (male and female) are siblings and then the dude gets killed. And it turned out to be one of the friends who was jealous. Does that sound familiar to anyone? I really cant remember the title...

Thanks!