Let your girlfriend know that her friend is ugly but don't say it to harsh and get her to choose someone else .
My Girlfriend Wants Me To Do Threesome With Her Friend.. The Problem Is Her Friend Is Ugly What Should I Do?
Tell your girlfriend that she is the only one you would want to be with and that you don't want to do that with anyone else... That way she will think your sweet and you would avoid having an awkward conversation about her friend and most likely she would tell her friend that you said she was ugly and that would cause problems.....And it really is your choice....so you can either do it..or not.