If that.
You think all these gals were running to the PB mansion at age 15 because they were angels?
If Cosby went to the extent of drugging, and having sex with a 15 year old girl, he is guilty of statutory rape in some states...being more than four years older, and without her consent, which cannot be given at that age depending on where it happened.
What she is becomes irrelevant.
http://www.sexlaws.org/answer_board_question-north_carolina_statutory_rape_laws
My State laws on the matter...each state being different.
All these girls? You mean the "one" 15 year old that he took to the Playboy mansion.