Since my bed is only about 5 feet away from hers, it is annoying and keeps me awake. I have tried earplugs. My, my, it must give you some interesting dreams.
Mice live in communal settings where coupling, birthing and every other part of life is in the open.
But you are not a mouse. There are good reasons to talk to your roommate about this. First it is annoying to you and you have a contractual right to a descent night sleep. Second it is a different person each night, suggesting that it is a virtual stranger to both of you. That is not safe from a security point of view.