Serge
it comes from a 1960's court case, and associated scandal in which a British Defence Minister called John Profumo was found to be sharing a prostitute / "girlfriend" with the senior Soviet Naval Attache... Quite a good effort by the Soviets - they got rid of one our more professionally minded (at the time) defence politicians
https://en.wikipedia.org/wiki/Mandy_Rice-Davies
https://en.wikipedia.org/wiki/John_Profumo