I read Jean Auel's first three books way back in the eighties. I do not remember when the movie was made of the first book, but I do know I was very much looking forward to it and very disappointed in it.
I bought the next three books as they were published, and put them on my bookshelves. I just could not garner up the interest, let alone the physical strength, to read such a gigantic tome as each one is.
Recently, I pulled out the 4th book, The Plains of Passage, and was surprised by two things: (1) it was published clear back in 1990, and it has been on my shelves ever since then! And (2) it is a signed first edition. It was quite a pleasure to get back into her writing and that time period.
Now, this is how I view her books. What I think she really set out to do was write a natural history of the period. They are really textbooks jazzed up to make them readable to the general public. I just flat out skip the long passages of lurid sex. I do not like to see, read about, or hear about sexual activities of OTHER couples. It feels like a dreadful intrusion to me, and really sets my nerve endings to jangling unpleasantly. And I agree that so many “firsts” and so many inventions on the part of that one woman ARE just plain silly. Admittedly, she does encounter many other ways of doings things and tools to do them with along the way during her very long journey. But again, I think the whole fictional account is just a long thread connecting the books and inserted for the purpose of making the learning process more palatable with a story line. And, frankly, I loved the learning process. I still have the last two books on hand, and perhaps will expire before finding the endurance to pick them up to read, but Jean Auel taught me just one awful lot about the ice age and the flora and fauna and so on. I like possessing some understanding of what this planet was like during that era.