Not Rape
She's damaged goods but by the time that scene occurs, she's clearly in love with him. Her refusal to have sex is not based on her lack of desire, her lack of attraction, or her lack of emotional connection. It is based on her psychological issues with sex.
He isn't very sympathetic at that point but some part of her wants him to take control, guide her, connect in a way that she doesn't know how.
It was a clumsy attempt to break her away from that, exploring the psychological techniques and theories of the time.
By today's standards, it wouldn't be acceptable but shit, what is acceptable by today's standards?