This website contains age-restricted materials including nudity and explicit depictions of sexual activity.
By entering, you affirm that you are at least 18 years of age or the age of majority in the jurisdiction you are accessing the website from and you consent to viewing sexually explicit content.
Came to post the same. Seems like the most awkward possible way to phrase that.
Your “Disks not included” suggestion, or heck, just “empty” would surely be better.