Their careers ended abruptly at the time that gender verification was introduced. Critics have suggested that the Press sisters were actually male, or perhaps hermaphrodites. Another allegation was that they were being injected with male hormones in order to make them stronger. Detractors called them the "Press Brothers". Both sisters had left the sporting scene by the time that gender verification for all international sporting female events was made mandatory in 1966. Some Western newspapers[which?] took that as a confession by the Soviet Union, but Russian newspapers still deny the allegations.