I want to ask my friend who is on their bang list.
Why do you want to know who is on it?
To see if the people on their list is also on mine.
That is not a good thing for you to do. Sexual matters shouldn't be discussed with friends. You should not worry about the things they do and just mind your own business.
Why shouldn't I? It's hard to avoid talks about sex.
It'll be fine only if the other person is okay with it. Some people get uncomfortable when you bring up sex.