https://en.wikipedia.org/wiki/Male_rape#Female-on-male_rape

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

This is caused by the fact that the FAQ takes it data from page 39.

The wiki takes data from page 24

https://www.reddit.com/r/MensRights/wiki/faq#wiki_21._are_male_victims_of_sexual_assault.2C_harassment.2C_or_rape_often_taken_less_seriously_than_their_female_counterparts_or_discriminated_against.3F

FAQ quote:

According to the CDC's 12-month statistics on sexual violence(the most accurate statistic on prevalence, 50% of the rape victims 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.

More direct comparison ( I am the worst OP)

Wiki quote: 93.3% reported that all the perpetrators were male.

Faq quote: 80% of the men were raped by women.

Discrepancy probably exists because of language change within the FAQ I think. It goes from talking about who is perpetuating sexual violence to 80% is raped. Sexual violence isn't the same as ra

EDIT: Think I found the exact cause of the discrepancy on page 24 of the CID pdf:

For male victims, the sex of the perpetrator varied by the type of sexual violence experienced. The majority of male rape victims (93.3%) reported only male perpetrators. For three of the other forms of sexual violence, a majority of male victims reported only female perpetrators: being made to penetrate (79.2%), sexual coercion (83.6%), and unwanted sexual contact (53.1%). For non-contact unwanted sexual experiences, approximately half of male victims (49.0%) reported only male perpe trators and more than one-third (37.7%) reported only female perpetrators (data not shown).

I think it might not be too far fetched that both sides are playing number games albeit in different ways.

Obviously its impossible to take the ratios at face values due to the issues involved with reporting bias.

Either way I thought the contradiction of numbers was interesting.