Rape
These are common nightmares that bring your awareness to being taken advantage of. The feelings in your life of feeling vulnerable, held against your will or being attacked in any matter. The attacker might be faceless suggesting the unknown or ignored feelings that are on you. The location will help give you a clue to what area to focus on. However, if you were attacked in real life then these dreams appear to be repressed feelings and memories. If they continue please seek professional assistance.