Since HIV is spread chiefly and primarily through sexual practices or by sharing needles, prevention messages on this site may address these topics. HIV prevention materials funded by CDC must be approved by local program review panels. However, the materials may be considered controversial by some viewers. This warning is included in compliance with CDC requirements for HIV educational materials Section 5, subsections 3 & 4, which are now (starting in the year 2002) extended to include information published on the Worldwide Web.