Naive - look at the cite on the first stat
From the fact sheet on Male Sexual Assault here:
http://www.mcasa.org/_mcasaWeb/wp-content/uploads/2011/07/2011_FactSheet_Males.pdf
71% of male victims were first raped before their 18th birthday; 16.6% were 18-24 years old, and 12.3% were 25 or older. National Institute of Justice, U.S Department of Justice. “Extent, Nature, and Consequences of Rape Victimization: Findings from the National Violence Against Women Survey,” P. Tjaden, et al. 2006
The year in a male’s life when he is most likely to be a victim of sexual assault is the age of 4.
Bureau of Justice Statistics, 2000
61% of male sexual abusers are male, 28% are female, and 11% of males reported being assaulted by both males and females. “Betrayed as Boys: Psychodynamic Treatment of Sexually Abused Men,” R. Gartner, 1999
Up to 1/2 of the female perpetrators were adolescent-aged babysitters. Female perpetrators used coercion, rather than force in 91% of the cases, and 26% promised special favors to boys for participation in sexual acts. JAMA, 1998
48% of males were raped by strangers, compared with 28% of females. U.S. Department of Justice, Bureau of Justice Statistics, “Criminal Victimization in 1999: Changes 1998-1999, with Trends 1993-1999,” 2000
Many rapes and sexual assaults are perpetrated by heterosexual men, in all-male environments, often as part of an initiation. Incidences of this have been documented in military organizations, fraternal organizations, athletic organizations, prisons etc. They often commit their crime with one or more cohorts. “Male on Male Rape: The Hidden Toll of Stigma and Shame,” M. Scarce, 1997
The organization Stop Prison Rape conservatively estimates that 360,000 men are sexually assaulted in prisons in the United States each year. For at least 2/3 of these inmates the rapes are not isolated events, but a repeated pattern (often as gang rapes). “Male on Male Rape: The Hidden Toll of Stigma and Shame,” M. Scarce, 1997