Human Rights Watch. "This Alien Legacy: the Origins of Sodomy Laws in British Colonialism." December 17, 2008.

This 66-page report describes how laws in over three dozen countries, from India to Uganda and from Nigeria to Papua New Guinea, derive from a single law on homosexual conduct that British colonial rulers imposed on India in 1860. This year, the High Court in Delhi ended hearings in a years-long case seeking to decriminalize homosexual conduct there. A ruling in the landmark case is expected soon. Download the report here: http://www.hrw.org/en/reports/2008/12/17/alien-legacy-0.