Interesting fact: majority of rape victims in USA are male.
This has been addressed a couple of times. Note that 1) the 216,000 number is for victims of "sexual abuse" which doesn't necessarily mean "rape" and 2) not all inmates of penitentiaries are male.
Also, isn't 216,000 a pretty small number (ignoring the, uh, horror of it)? I usually hear numbers like "1 in 6 women" or "1 in 4 Native American women".