In incidents of sexual violence reported to the National Crime Victimization Survey, 38 percent of victims were men––a figure much higher than in prior surveys.
This was in 2016, 4 years ago. Obviously, the figure has gone up since then, I’ll be looking for another article that’s more recent to see and compare the percentages of assault victims.
After pooling and analyzing the data gathered in the years 2010 through 2013, the authors found female perpetrators acting without male co-perpetrators were reported in 28 percent of rape or sexual assault incidents involving male victims and 4.1 percent of incidents with female victims. Female perpetrator was reported in 34.7 percent of incidents with male victims and 4.2 percent of incidents with female victims.
Source: https://www.theatlantic.com/science/archive/2016/11/the-understudied-female-sexual-predator/503492/
This here is the most up to date source I could find, this is in the US from 2000-2018. I can’t find anywhere that’s up to date as this for the UK.

source:
https://www.rainn.org/statistics/victims-sexual-violence
Researchers have found that at least 1 in 6 men have experienced sexual abuse or assault, whether in childhood or as adults. And this is probably a low estimate, since it doesn’t include noncontact experiences, which can also have lasting negative effects. If you’ve had such an experience, or think you might have, you are not alone.
Having such an experience does not mean a boy will suffer significant long-term negative consequences. That depends on several factors, including how many times it happened, how long it went on, who else was involved, whether the boy told anyone and, if so, the response he received.
This is probably the ONLY source I’ve seen that is dedicated to the men, and I highly recommend reading more and use this a lot more in my research.
Source: https://1in6.org/get-information/the-1-in-6-statistic/
