I read this the year it came out, when I was in my Heinlein phase. I do believe that I selected the book mainly on the titillating cover, but I think it would attract any adolescent SF reader. And, yes, compared to his works like [b:The Moon Is a Harsh Mistress|3274505|The Moon Is a Harsh Mistress|Robert A. Heinlein|https://d202m5krfqbpi5.cloudfront.net/books/1215388147s/3274505.jpg|1048525] and [b:Stranger In A Strange Land|1777966|Stranger In A Strange Land|Robert A. Heinlein|https://d202m5krfqbpi5.cloudfront.net/books/1195503994s/1777966.jpg|908211], Friday is quite adolescent in story and theme.
So, I read worse Heinlein novels, like [b:Starship Troopers|573833|Starship Troopers|Robert A. Heinlein|https://d202m5krfqbpi5.cloudfront.net/books/1304018517s/573833.jpg|2534973], that (in hindsight) are more insipid and adolescent. I think Friday ranks with [b:Glory Road|2271981|Glory Road|Robert A. Heinlein|https://d202m5krfqbpi5.cloudfront.net/books/1225595012s/2271981.jpg|1862679], but is definitely inferior to the first two books I mentioned.