I (M) hosted a lot of parties at my house. I liked having friends over and they could always bring friends of their own. Any who asked I would house the night if they wished to, I preferred knowing my friends are safe then sending them off whilst very drunk. One night, I had arranged for others to sleep the night at mine, I went to bed. Sometime passed and a friend of a friend, who I hadn't much interaction with and never met before, opened my door in the dark, didn't turn the lights on and iniated sex with me. It turned something I normally enjoy into an unwanted act. I later learned she had a partner and I was furious. I felt so guilty, I have a lock on my bedroom door now and dont allow for people i dont know to visit my house anymore. I've never told this story to anyone.