Haha "Issues regarding sex are only written about in some of them."
This is why you should read books before trying to educate other people on what's in them. I can't think of a topic more frequently mentioned in the bible than sexual morality. It permeates the entire text, since it's one of its core theses.
I don't have much else to say to be honest. Ask yourself, can you think of a single other book where it would be even remotely socially acceptable, much less helpful or productive, for you to say "I have never read this book, but I would like to explain what its message is to people who have actually read it."
If you want to have an opinion on the book, read it.