42 USC 12211 - Definitions

(a) Homosexuality and bisexuality 
For purposes of the definition of disability in section 12102 (2) of this title, homosexuality and bisexuality are not impairments and as such are not disabilities under this chapter.
(b) Certain conditions 
Under this chapter, the term disability shall not include
(1) transvestism, transsexualism, pedophilia, exhibitionism, voyeurism, gender identity disorders not resulting from physical impairments, or other sexual behavior disorders;
(2) compulsive gambling, kleptomania, or pyromania; or
(3) psychoactive substance use disorders resulting from current illegal use of drugs.