the original song the Benji B(uk) remix with strings the Ahmed Sirour remix w/ strings Each one slightly different. I didn't think much about Birthday Sex when I first heard it, except all of my younger co-workers at a school in Brooklyn played that song over and over once the boss left. I like this song though. It was Ahmed's remix that brought me to it. Peep the facial expressions in Benji B's video. Some of them are clearly not feeling it, but hes into it. Haha. Back to resting from a cold.