"Prostitution is only a specific 
expression of the general prostitution of the 
labourer, and since it is a relationship in which 
falls not the prostitute alone, but also the one 
who prostitutes — and the latter's abomination is 
still greater — the capitalist, etc., also comes 
under this head."

Marx, "Economic and Philosophic Manuscripts of 1844"


"Marriage itself remained, as before, the legally 
recognized form, the official cloak of 
prostitution."

Engels, "Socialism: Utopian and Scientific," Chapter 1

"And here is the answer to the outcry of the highly 
moral philistines against the 'community of 
women.' Community of women is a condition which 
belongs entirely to bourgeois society and which 
today finds its complete expression in 
prostitution. But prostitution is based on private 
property and falls with it. Thus, communist 
society, instead of introducing community of 
women, in fact abolishes it."

Engels, "The Principles of Communism," 1847