First, Doyle says:
The one thing that I didn't like was the hetting-up of Andrew, but I can fanwank it as his two fabulous girl-pals who are just escorting him to a great gay bar. (And - "blonde hair and blue eyes"? I couldn't work out whether that was a continuity boob or Angel just got distracted by the other blue-eyed blond he's crazily in love with...)
astridv says: I believe the consensus here is that those were two slayers, out for a night of undercover slaying.
And here I thought I was the only one with the "escorting to gay bar" theory about Andrew and the girls.
My other theory is that Andrew already had a boy picked out for a date, and the girls were the lesbian couple with whom he and the man had a double date. The three of them were just on their way to pick up the man and head to the opera.