what are CONCUBINES? prostitutes
As defined by Wikipedia:
The term concubine generally signifies ongoing, quasi-matrimonial relationships where the woman is of lower social status than the man or the official wife or wives. Some historical Asian and European rulers maintained concubines as well as wives.
Historically, concubinage was frequently voluntary (by the girl and/or her family's arrangement), as it provided a measure of economic security for the woman involved. Involuntary, or servile, concubinage sometimes involves sexual slavery of one member of the relationship, typically the woman.
Where it has a legal status, as in ancient Rome, concubinage is akin, although inferior, to marriage. In opposition to those laws, traditional Western laws acknowledged marriage as the only marital relationship, until civil unions and domestic partnerships were accepted or created