Weekend in Stockholm (1976)

A young red haired girl arrives at Stockholm Central. She's in Stockholm to visit her long time friend Marie. Marie's boyfriend Jan, a fat ugly guy in all denim clothing, is there to pick her up. They drive around Stockholm till night falls. Later in Marie's apartment the three of them all end up in bed. Jan needs help so he gets on the phone to call his Norwegian friend Kent. The redhead falls in love with Kent. They have sex in a lot of various places. And ends up in a three-some.