Am I unreasonable by being uncomfortable by this?

I work from home. And my male flatmate keeps having tinder dates over. They sleep together on the first date, and then usually he goes to work and then the women stay in the apartment during the day until he comes home so he can drive them back.

But I feel so uncomfortable having a complete stranger in my house and it just feels awkward. Plus they are going to the kitchen, making themselves drinks and they don’t come and introduce themselves to me.

I worry as well because I’ve got lots of expensive belongings. I don’t know who these women are but they could just go in my room and take it