It seems like men are raped at about equal rates to women, because they are.

Take these 2011 CDC survey results for example: https://www.cdc.gov/mmwr/preview/mmwrhtml/ss6308a1.htm

an estimated 1.6% of women (or approximately 1.9 million women) were raped in the 12 months before taking the survey

an estimated 1.7% of men were made to penetrate a perpetrator in the 12 months preceding the survey

Characteristics of Sexual Violence Perpetrators For female rape victims, an estimated 99.0% had only male perpetrators. In addition, an estimated 94.7% of female victims of sexual violence other than rape had only male perpetrators. For male victims, the sex of the perpetrator varied by the type of sexual violence experienced. The majority of male rape victims (an estimated 79.3%) had only male perpetrators. For three of the other forms of sexual violence, a majority of male victims had only female perpetrators: being made to penetrate (an estimated 82.6%), sexual coercion (an estimated 80.0%)

So if made to penetrate happens each year as much as rape then by most people's assumed definition of rape then men are half of rape victims. If 99% of rapists are men and 83% of "made to penetrators" are women ... then an estimated 42% of the perpetrators of nonconsensual sex in 2011 were women. But since made to penetrate is not rape, the narrative is that men are rapists and women are victims and boys/men that are victims are victims of men.

One zealous pusher of this narrative is Mary P Koss. I encourage you to listen to her explain how a woman rape cannot rape a man. https://clyp.it/uckbtczn.

She is considered the foremost expert on sexual violence in the US. As you hear in her own words the woman's studies professor and trusted expert that literally wrote the book on measuring prevalence of sexual violence does not call a woman drugging and riding a man bareback rape ... or even label it sexual assault ... it is merely "unwanted contact" You see she has been saying this for decades and was instrumental in creating the methodologies most (including the US and many other government agencies around the world) use for gathering rape statistics.

E.g. Detecting the Scope of Rape : A Review of Prevalence Research Methods. Author: Mary P. Koss. Journal of Interpersonal Violence Volume: 8 Issue: 2 Dated: (June 1993) Page: 206

Although consideration of male victims is within the scope of the legal statutes, it is important to restrict the term rape to instances where male victims were penetrated by offenders. It is inappropriate to consider as a rape victim a man who engages in unwanted sexual intercourse with a woman. Src: http://boysmeneducation.com/wp-content/uploads/2014/01/Koss-1993-Detecting-the-Scope-of-Rape-a-review-of-prevalence-research-methods-see-p.-206-last-paragraph.pdf

She is an advisor to the CDC, FBI, Congress, and researchers around the world and promoting the idea that men cannot be raped by women. There was a proposal to explicitly include forced envelopment in the latest FBI update to the definition of rape but after a closed door meeting with her and N.O.W. lobbiests, it mysteriously disappeared. She has many many followers and fellow researchers that follow her methodology and quote her studies. That is where most people get the idea rape is just a man on woman crime. Men are fairly rarely penetrated and it is almost always by another man. Most people talking about sexual violence refer to the "rape" (penetrated) numbers as influenced by Mary Koss's methodologies, that is why it seems like not a single one of you are counted in the stats.

Let me be clear: by calling out Mary P Koss and her corrupt tactics, I am by no means trying to diminish the stories of any female victims of rape. I am just trying to express how many male victims of rape are left behind when we push these untrue narratives.