You can't speak of SMV in this situation, because there is no market to speak of. Women were either captured and coerced into sleeping with the Nomenklatura, or they were working as whores, getting compensated with better living conditions for them or their families than the plebes (who of course in the USSR were 99% of the population), or sometimes to save a close relative from the gulags. Most of the time it was somewhere in between, but people like Beria were notorious in combing the streets for good looking women or men to rape for him and other top commies.
“Nothing is more useful than to look upon the world as it really is.”