And it's against men.

A man in Brazil who is accused of the, albeit heinous, crime of raping and murdering his own baby stepson gets raped in prison by twenty men while being stabbed repeatedly. And the masses celebrate:

http://www.lipstickalley.com/showthread.php?t=687614&nojs=1

http://forum.bodybuilding.com/showthread.php?t=161550473

http://www.mixedmartialarts.com/thread/2314674/BJJ-BB-raped-by-20-imates-after-child-abuse/?pc=1

http://www.np.reddit.com/r/WTF/comments/23vedm/ju_jitsu_fighter_raped_stabbed_20_times_in_prison/

This is the exact type of rape culture that I've been hearing about, but I've never heard anybody cheering the idea of 20 people raping a woman's asshole while stabbing her.

I'm now a believer in the existence of rape culture, but not the kind that most people might think.