(3) Nothing in this section creates a cause of action or a right to bring an action, including an action based on discrimination due to sexual orientation. As used in this section, the term “sexual orientation” means consensual homosexuality or heterosexuality. This subsection does not limit any existing cause of action or right to bring an action, including any action under the Administrative Procedure Act [ 5 U.S.C. 551 et seq., 701 et seq.] or the All Writs Act [ 28 U.S.C. 1651 ].