Girls, How do I talk to my roomate about not having her or her friends sleep on my bed in the dorm when she comes home drunk?

So my room at told me that she and her friend slept on my bed when they came home drunk while I wasn’t there and I don’t have much rules just I don’t want people sleeping on my bed or touching my stuff is there a way I can get it across that it’s serious without being a bitch.

Girls, How do I talk to my roomate about not having her or her friends sleep on my bed in the dorm when she comes home drunk?
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