The Old Bailey has been told that the men deliberately targeted vulnerable young girls, often those living in care and with troubled and unsettled lives.
They found girls who were "out of control" and may already have been sexually abused.
They would frequently approach the girls while they were playing truant from school or out having an illicit drink. The men groomed the girls by offering them alcohol, or sometimes by simply offering the kind of attention they craved and that was missing from their lives.
They would hook the girls in by plying them with drink and often gave the girls drugs, including cannabis, crack and sometimes heroin, which they then became addicted to.
More top news
A five-year-old boy whose surprise meeting with "Spiderman" became an online hit has died.
It's going to feel very cold in parts today, with temperatures between 3C and 6C before falling to as low as -6C in some areas overnight.
A son paid off his parents' mortgage for Christmas - reducing them to tears.