I don't understand what is wrong with that comment. It was from a psychology class. For, some rapists or gropers, their motivation is thinking that once they start the woman would reciprocate. Like Zaphod said there are socially backwards people that don't know how to function in society. I didn't say women who are raped actually like it.
Psych 101. But, there could be other reasons rapists do what they do, and I did include gropers, even catcallers could be included. Some here are overreacting IMO.