There are six sex scenes in the film, averaging one for every 12.5 minutes of run time.
Professor James Matthews is the only character in the film with a first and last name, and the only one not to appear in a sex scene.
It was released directly to video in 2004 under the title Teenage Cavegirl, and is shown on cable as Bikini Cavegirl. There is a heavily edited version with about 34 minutes of sex and full frontal nudity cut out released under the title Stone Age Sirens.
Filmed at the same time as Jeannie In A String Bikini using many of the same cast members and locations. The combined shooting time was 5 days.
The spaceship shown at the end is the Jupiter 2 from Lost in Space (1965).