This is (I believe) a European movie from 70s. A rich guy is traveling Europe (Italy?) together with a poor young couple.  A girl sleeps with  him, and at the end appears, a boy does the same.

This is American movie (from 70th?). A young couple with almost no money drives their old car to some city to “get a job”. Their car gets broken at a gas station in the middle of nowhere and a greedy gas station owner/mechanic  takes advantage of the situation. As a result they cannot leave a gas station and have to pay him more and more for car fixes. At the very end it appeared that these nice young people are actually robbers who were going to “do job” – rob a wine store, and they are going to kill a gas station owner and his wife.