The women aren't "easy," they're empowered and not in love with Grayson; they're simply experiencing their sexuality freely with someone who's a celebrity among them. Imagine, for example, that today Henry Cavill temporarily joined your workplace, befriended you and your friends, who are ordinary people, and you and they had the chance to sleep with him... that's more or less what happened in the story. Dominant Alphas are rare, and Grayson is a super-dominant one. He's the standard type in this society. They're just having fun, and nobody's being deceived.

Ugh, they make the women look really easy/easily fooled in this story. Like, none of them had a partner? A crush? A brain?