Via Spencer Ackerman, a deleted scene from Iron Man if you haven’t come across it.
Since we can see the glowing ring beneath Tony Stark’s shirt, we can tell the scene follows Stark’s rescue. I’m thinking the scene’s business was to place Tony closer to Afghanistan so it would “make sense” that he could get there in his suit. It probably made sense to cut it. There’s some development of the relationship between Pepper and Tony, but probably not enough to make it worth keeping. And the seeming setup for a group-sex session (admittedly a total fakeout) was edgy for the rating.
The lack of music (even in the part with dancing) gives the clip an eerie feel.