If you work at things in life, you might eventually attract a female of the human species who might want to spend her life with you. It's a far-fetched idea, I know, but stay with me and imagine. Females, in general, often are more sensitive than males, particularly to things life R-rated language, etc. That hypotheitical, but still possible female, might start to share your Audible account (or physical library of books) with you and read/listen to the same books you do. She might appreciate not listening to/reading things that she might find offensive that you don't give a second thought to.
Sound amazing? Well there's even more crazy out-of-the world possibilities. If you do find that female, you could even (gasp!) have children together. Like the female companion, those kids might even learn to read. Or they might be born with normal human organs like ears, and have the capability of hearing sound. As they grow older, they too might listen to your audio book library or read copies of books you have on the shelf. I know I'm being old fashioned, but I don't think it's a great idea to have my 4th grader reading books filled with the F word. If the totally unexpected happened where you attracted a mate, reproduced, and then had children with the basic reading/hearing functions intact, you might feel the same way.