[alecbenzer]

Don't have a link but I recall seeing stats that implied men were raped more often when prison rape stats are included.

[Anechoic]

The one source I know of [2] claims 216,000 victims of "sexual abuse", but doesn't say specifically is sexual abuse means "rape" or if those numbers are only for male prisoners.

1. http://nplusonemag.com/raise-the-crime-rate