Haven't read the thread, but here's the simple answer:
Bringing a "friend" along on a date is something all girls feel compelled to do when they don't know the guy. YOU might think you're going on the date but the girl is thinking she's going out on a friendly "get to know you" encounter. A "date" implies some sort of commitment to the idea of giving serious consideration to becoming your girlfriend, whereas if she brings along a 'friend' she can just say to herself that she was out having fun.
How would you not know a guy you r going on a date with? Unless they met on paltalk, facebook, snet
Even if they did, who would go on a date right away, u have to get to know the person a little more. Arag hadaa isku aamini kartit. I do agree that when it comes to a "date"...there is a serious consideration involved. Laakiin, why doesn't the girl tell him from the start that she will bring a girl cause she won't be comfortable or whatever her reason might!?