I have the same symptoms, although there were some things in my life that could cause this, because my boundaries were often crossed in childhood, sometimes in a sexual way. Yet the thoughts don't always go around the "real" situations and they're causing me distress. As a child I remember finding this article about a therapeutist who made her client believe she was abused by her father, though she really wasn't. This also caused me some ocd thoughts about exactly same thing.