This situation sex comedy falls somewhere in between vulgarity and burlesque. Ulli (Giuliano Gemma) and his six cave-dwelling cronies try to learn all the conveniences of their era — like building fires, using the wheel, and perfecting the use of tools and weapons. A fire engulfs their tiny island and the men are forced to take a raft to the unknown mainland. There Ulli meets Filli (Senta Berger), and he spends his time trying to make her his monogamous girlfriend by discouraging others who desire her for their own.

1. QUANDO LE DONNE AVEVANO LA CODA
2. NASCITA DI FILLY
3. CAN CAN DELLE 'FILLY'
4. MARCETTA DEI SETTE
5. I CIVETTONI
6. ULLI,GRRR,MALUC,PUT,UTO,ZOG,KAO
7. BALLETTO SULLE UOVA
8. CAN CAN DELLE 'FILLY'
9. PANTOMIMA DELLE CAVERNE
10. INTRODUZIONE ALL'INTRODUZIONE DI UNA INTRODUZIONE
11. PRELUDIO ALLA GIOIA