After his death, his entire social-sexological collection as well as his private archives were placed in the International Institute for Social History (IISG) in Amsterdam (www.iisg.nl), this without the visual material which had been seized by the authorities. The executive board of the foundation continued its activities; in 1998, the "Fund for Scientific Research of Sexuality" was set up, with the stated aims of: obtaining more insight into sexual development processes in relation to social, emotional, cognitive and physical development; contributing to sexual health and to helping develop the capacity for relationships, and a sense of responsibility; supporting parents, guardians, educators, teachers, public relations officers and care and welfare workers by effectively channelling the knowledge gained from research; and promoting debate in circles of lawyers, sociologists, government officials and politicians on various social and legal frameworks.