38% of the victims of rape were men in the 2012 National Crime Victim Survey. (This study requires men to classify their victimization as rape and as a crime, both requirements lead to a reduction of admitted male victims relative to other survey instruments so this number is only a lower bound on the number of male victims of rape.)

—http://ajph.aphapublications.org/doi/abs/10.2105/AJPH.2014.301946?journalCode=ajph

43% of college men and high school youth report being sexually assaulted or raped. 95% by women.

http://www.apa.org/pubs/journals/releases/men-a0035915.pdf

http://tinyurl.com/nsdsxgg

51% of college men report being sexually assaulted or raped since the age of 16. 95% by women.

http://www.apa.org/pubs/journals/features/men-13-3-243.pdf

http://tinyurl.com/qgjzfwk

According to the CDC's 12-month statistics on sexual violence(the most accurate statistic on prevalence, 50% of the victims of “forced sex” were male. According to the CDC's lifetime statistics(the most accurate statistic regarding who is raping who) on who is perpetuating sexual violence, 80% of the men were raped by women.

http://i.imgur.com/Ps9wW.jpg

http://www.cdc.gov/violenceprevention/pdf/nisvs_report2010-a.pdf

Here’s a recent world wide survey that found that 3% of men reported forced sex in their heterosexual relationships and 2.3% of women reported forced sex in their heterosexual relationships.

http://pubpages.unh.edu/~mas2/ID45-PR45.pdf

Also recent results on sexual exploitation in correctional facility finds extremely high rates of female on male abuse.

“Approximately 95% of all youth reporting staff sexual misconduct said they had been victimized by female staff. In 2008, 42% of staff in state juvenile facilities were female.”

From “Sexual Victimization in Juvenile Facilities Reported by Youth, 2008-09″

http://bjs.ojp.usdoj.gov/content/pub/pdf/svjfry09.pdf

“Most victims of staff sexual misconduct were males; most perpetrators were females. Among male victims of staff sexual misconduct, 69% of those in prison and 64% of those in jails reported sexual activity with
female staff. An additional 16% of prison inmates and 18% of jail
inmates reported sexual activity with both female and male staff.”

From “Sexual Victimization in Prisons and Jails Reported by Inmates, 2008-09″

http://bjs.ojp.usdoj.gov/content/pub/pdf/svpjri0809.pdf