To Be Twenty (movie, 1978)

Lia and Tina are two beautiful girls who meet and realize that they have a lot in common. They are both young, beautiful and pissed off, so they decide to hitchhike their way to Rome to find Nazariota's commune, a place to stay for free and have all the sex they want... or so they think. Things don't go as they have planned though, and soon they become involved in prostitution, the police and an aggressive gang.