two former casino workers and a former model spoke out for the first time .
they were aged 20 , 24 , and 27 at the time of the alleged assaults .
all claim cosby , 77 , gave them either drugs or alcohol .
one described ` waking up in bed naked next to him after being drugged '
gloria allred , lawyer for many of the 38 alleged victims , represents them .
she said she planned the press conference to damage cosby 's ticket sales .