I would not have predicted this. (I think I would have predicted some sort of desensitisation.)

Viewers of prime-time crime dramas, like NCIS, CSI or Law & Order, are more inclined than nonviewers to see themselves intervening on behalf of the victim of a sexual assault, according to recent research at Washington State University.

Published in the January issue of the Journal of Health Communication, the study suggests prime-time television may be a successful medium for educating the public about sexual assault and encouraging positive responses, said Stacey Hust, associate professor in the Edward R. Murrow College of Communication and lead researcher.

A once taboo topic on television, sexual assault has been depicted with increasing frequency in prime-time television programming, Hust said. Previous research indicates that crime dramas include nearly six violent acts per hour, about a tenth of which are related to sexual assault.

“Although content analyses have not established whether crime dramas portray individuals intervening in sexual assault, we knew from watching some of the programs that at least some episodes featured bystanders who intervened before the crime or who came forward to help after the crime was committed,” Hust said. "We wanted to see if watching these programs was associated with bystander intervention.”
[More here: wsu via sociologicalruminations]