Much like female erectile response and contrary to popular opinion, male erectile response is involuntary, meaning that a man need not consent for his penis to become erect and be placed in a woman's vagina. Penetration of a man by a woman is possible through use of a strap-on or other object. Rape of a man by a woman could also occur when limited sexual activities are agreed upon and a man's penis is placed in a woman in violation of the limits that had been set. Rape of a man by a woman is thus possible in several ways.
However, male victims of sexual abuse by females often face social, political, and legal double standards. While gender-neutral laws have combated the older perception that rape never occurs to men, and other laws have eliminated the term altogether, the double standards still remain.
It's all about fantasy (and wall of text), so don't get mad. Also most of stuff posted here is NSFW, so...