Is it normal that i often dream of having sex with serial killers?

I often have strange dreams about falling in love with a man and then having sex with him, only later to find out that he is a serial killer. Later on in the dream, i realise i am pregnant with his baby and that is why he wont kill me, but he kills all of my closest friends. My most recent dream was about being involved in the classic 'Saw' games, but falling in the love with Saw so he lets me go. I have previously had dreams like this but with Voldemort from Harry Potter. In my dream there is a very clear feeling of mutual love. Is this normal?