Boyfriend House

My boyfriend friend loves bringing different girls over to fuck them and my boyfriend have no problem with his friend doing that because his friend can't bring the girls to his own house. I feel a way because it 10+ girls that have been to my boyfriend house even thought my boyfriend doesn't do anything it bothers me and when I tell him he doesn't think it should be a problem . I don't want to go to his house if you have 10 different girls there all the time. Any comments ?