Acquaintance or date rape can consist of any level of force. The difference between "date rape" and "rape" is simply that it was someone she was acquainted with or went out on a date with. But since it doesn't require physical struggle and threat of a weapon (knife, fists, gun), the status of the coercion is being reduced to the psychological level.
The question becomes, "How did he make you do it, if there was no threat of physical violence or any actual violence involved?"
I submit that there are men willing and capable of using psychological coercion very effectively to get what they want. I have known a few in my time. However, whether or not to call that rape is for others to decide, and not for me.