No fans...as far as know.
I don't know the details of the actual production...but I am sure that free drinks
are somewhat of a draw for any of the extras that might be involved for filler
and flair.
I have heard some funny stories of big party scenes like that where some of the
non-sex extras did become involved in the sex.
(...an interesting concept IMO...and one that I am surprised hasn't really been
utilized by certain producers....fake it...but in a somewhat realistic manner...in some
sort of a BTS type of way.....sometimes even a little suck can be something very special.

)