looking american movie with erotic scene

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I remember that the movie was about young upper class people. Very first part of the movie, the couple had sex and they were smoking pot(with some pipe I guess..?). Then they went to funeral. And there was a three or four some scene and the girl had blonde hair. The boyfriend of the girl was looking at her with complicated face. I guess it is an american 2010s film. I think it was not that popular movie. I’d really appreciate if someone help me with findingšŸ˜­

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