Kees Waaldijk -- "Same-Sex Love Law: Transnational Trends" (farewell lecture, Leiden University, 27 June 2025)

This is the video recording of Kees Waaldijk's Farewell Lecture as professor of Comparative Sexual Orientation Law at Leiden University, on Friday 27 June 2025 (the lecture itself starts at 00:02:18). He has held this sponsored chair (at Leiden Law School's Grotius Centre) from May 2011 until November 2025.
During this lecture a moving visualisation is shown of Kees Waaldijk's Global Index on Legal Recognition of Homosexual Orientation (GILRHO, which gives up to eight points to countries that -- over time -- have decriminalised same-sex sex, and/or have prohibited sexual orientation discrimination, and/or provide some degree of family law recognition to same-sex couples); the GILRHO scores are shown in relation to Gross Domestic Product per capita (in constant US dollars, according to World Bank data), and in relation to the percentage of respondents in the various waves of the World Values Survey and the European Values Study, who mentioned 'homosexuals' as a group they would not want to have as neighbours. 
At the end of his lecture (from 00:59:20), some words were spoken by professor Suzan Stoter (Dean of Leiden Law School), by professor Christa Tobler (on behalf of the 'Curatorium' of this chair), by professor Helen Duffy (on behalf of the Grotius Centre for International Legal Studies), and by Dr Seun Bakare (on behalf of Kees Waaldijk's colleagues worldwide).
So far no written version of this lecture is available, but there is a brief online report about it. 
A full description of the methodology of GILRHO, and an analysis of its interaction with GDP per capita, can be found in the article: MV Lee Badgett, Kees Waaldijk & Yana van der Meulen Rodgers, ‘The relationship between LGBT inclusion and economic development: Macro-level evidence’, 120 World Development (August 2019) p. 1-14, available in open access (including, in Appendix A under “Download Spreadsheet”, the provisional 1966-2011 dataset of GILRHO). The GILRHO dataset upto 2025 has not yet been published.