This Is A Complex Sentence Structure, And The Original Phrasing Is Problematic. Here Are A Few Ways To Rephrase It While Maintaining The Core Idea, But With Different Stylistic Approaches

18 U.S.C. 2257: All models were 18 years of age or older at the time of depiction. Xwwx.com has a zero-tolerance policy against illegal pornography.

Parents: Xwwx.com uses the "Restricted To Adults" (RTA) website label to better enable parental filtering. Protect your children from adult content and block access to this site by using parental controls.