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That data doesn’t control for rates of self-reporting over the two sexes, though. Perhaps more women self-report because it’s more socially acceptable than men doing it?
The same thing could be said of male victimization reports, vs female victimization reports. Men are said to be more reluctant to report being a victim due to the social stigma attached. However, for the theory that women are more inclined to admit to sexually predatory activity: I think you'd have a hard-sell to claim that it's more "socially acceptable" for women to admit they sexually assault people. It goes against a lot of what we already know about how women
under-report their number of sexual partners compared to what men report. We can actually prove this ... Consider an analogy: there's a ball with 5 men and 5 women. Each man claims to have danced with 3 women, each woman claims to have danced with 1 man. Try and draw a graph showing who danced with whom, and you get a contradiction. So, men highly exaggerate number of partners and/or women downplay number of partners. Saying that there's an opposite effect when it comes to admitting sexual assault seems a little contradictory.
However, since these crimes don't occur in a vacuum we can cross-check the claims of victims to estimate the gender-proportions of perpetrators.
Going only off the CDC 2010 report: 1.267 million men said they were forced to have sex during the last 12 months in 2010, and 1.27 million women said the same thing. So that can just be called parity for a start. Next, about 95% of the women say a man did it, and about 80% of the men say a woman did it. Women therefore did 5% of female abuse and 80% of male abuse, and men did 95% of female abuse, and 20% of male abuse.
Putting those numbers together, the proportion of perpetrators should be 85-female to 115-male. 85/200 = 42.5% female, which is basically identical to the 43.9% from the large-scale survey. And that's only going off the claims of victims.