The explanation behind the taboo behind rape/sexual assault versus acceptance of violence I'm new here, so I apologise if this question doesn't fit the parameters required for this site, but I couldn't find a more appropriate stackexchange site to post it.

In TV shows, films, news and other forms of media, there is a very big taboo against portraying rape be it fictional, or a footage of the event. I can understand the sensitivity regarding the latter, but when we instead consider violent scenes, or footage of violence - our tolerance seems much higher. News channels, for example, conveyed the footage of a soldier being burned alive by ISIS in a cage. But depicting a video of a man inappropriately touching a woman would invite a huge backlash. To a lesser extent, this issue also extends to violence against women being portrayed in media (taking hollywood as an example, it is very rare that they convey violence against women, and if they do it is far less severe than that against men). This last point referring to violence which is not necessarily sexual in nature against women is not the main point of my question, but rather an observation which may or may not be relevant for an answer. 

To summarise, what are the psychological reasons for our 'acceptance' of very severe violence in media whilst there is a strong taboo against comparatively less severe sexual assaults. (e.g. in Game of Thrones, compare the torture of Theon Greyjoy to the criticism of the implied offscreen rape of Sansa).
Depiction of violence towards women triggers sadism in us much more effortlessly than other kinds of violence or torture. A recent study on correlation between violent videogames and violent attitude found no link between the two. But there are plenty of studies that show direct link between consumption of violent pornography and aggression towards women. Here is a meta study with tons of citations: http://aurora.umn.edu/pdf/ResearchOnPornography.pdf

Sadism is different from psychopathy. Psychopaths are apathetic, sadists are not. A recent study on sadism shows that sadists rated the pain experienced by the victim as more intense than the non-sadists did.

Inability to form emotional disconnection and higher awareness of the victim's suffering together can explain why we people triggered by sexual violence way more easily than non-sexual violence. From the famous Milgram experiment to very recent studies like this one:http://journals.sagepub.com/doi/abs/10.1177/0956797613490749 clearly show us that everyday sadism is very common. However, I don't know why sexual violence triggers sadism in us more easily than non-sexual torture.