Very interesting.

Prostitution is not compatible with the Soviet workers’ republic for a third reason: it does not contribute to the development and strengthening of the basic class character and of the proletariat and its new morality. What is the fundamental quality of the working class? What is its strongest moral weapon in the struggle? Solidarity and comradeship is the basis of communism. Unless this sense is strongly developed amongst working people, the building of a truly communist society is inconceivable.

The word moral/morality is used 19 times in her essay: https://www.marxists.org/archive/kollonta/1921/prostitution.htm

However, from the specific sample you have picked, one wouldn't have known Kollontai's emphasis on a need for "a new morality."