I'm sure all those girls knew exactly what they were doing. They were willing to trade sex in order to make it big in hollywood. It was a trade and both parties agreed to it.
There are three possibilities
1: They did the trade and both parties agreed to it (This is what you said)
2: Girl was told she has to meet Harvey in a hotel or at some other place and without her consent forcefully made physical relation with her.
3: Girl traded herself to be big in hollywood, Traded herself for it then urged for more money by blackmailing him after being denied she made up the story.
You cannot pass judgement without making one of them confess or by providing a good proof that one them is lying.