People have never talked about dreams openly, in this day it is considered weird to reflect upon your dreams as meaningful or usefull. I believe that if you are a true dreamer then you should not feel ashamed for what you dream. I however do not believe that people naturally do sick things in there dreams, it just doesn't make sense. Acts like rape are almost always either inspired because of group behaviour or a mental disorder. It is not unusual to see people who have sexual fantasies about things like bondage, which is not about torture as all the particapants co-operate unlike in rape. It is natural for humans to feel sympathy for one another and only a people with a strong pyschopathic tendency would willing commit a cruel act.
I often kill people in my dreams but never do I feel any particular emotions when killing the person, I'm just indifferent to it. I personally don't like sharing stories of when I have crazy sex with three women in a plane flying through the galaxy because it's my own personal business and as you can see a dream can reveal alot about a person. There is so much amazing things to do in a dream I dobn't know why I would waste my time doing sick stuff.