No heads up for random boyfriend visits

So my roommate and I share a lease. She has her boyfriend come over a couple times a week, and I’ve asked her SEVERAL times if she can please shoot a text prior to him coming over (I think it would just be a courtesy thing, plus we share a bathroom and it’s just one bathroom. Plus if I walk around wearing no bra and short shorts, I would like to know when a guest will be over so I can not dress like that.) I just want to be comfortable in my apartment. She refuses to send a text message or let me know because she claims it’s not necessary and she lives there too, so she doesn’t need to do anything I ask. (I get that she’s right, but I would just like the action out of courtesy. I’m sure we’re far past that though.) How can I get her to at least send a quick message or something?