Sexual Abuse Support Group
Sexual abuse is a relative cultural term used to describe sexual relations and behavior between two or more parties which are considered criminally and/or morally offensive. Different types of sexual abuse involve: Non-consensual, forced physical sexual behavior such as rape, incest or sexual assault, or psychological forms of abuse, such as verbal sexual behavior or...
Would be festive.
...Seriously though, you could pepper spray him, although you might get sprayed with the backspray, this often happens if you use capsaicin in confined areas.
Get a hasp and padlock as well as a door bar for the inside of your room.
Whenever you are in your room, lock it up tight. He wants to assault you, he'll have to break down the door, and that is rather hard for others in the house to ignore.
Try to be out of the house as much as you can.
He makes an interesting point as well. Can you lock your door? I'm guessing you share a room though don't you?