One scene that comes to mind where it's girls-on-one-guy from the early days of porn is Tom Bryon taking on Tracy Adams, Victoria Paris, Debbie Diamond, and Tiana in a "Buttman" sexvid. Tom was still pretty young then and had the goods, delivering good fucks to each of the girls--with Tiana getting the cum shot.
Recently, Erik Everhardt took on three or four girls in Digital Playground's "Nurses" sexvid. It was a pretty good scene, because Erik aggessive style needs to be balanced out by having more than one girl take him on.
On the web, the "Party Hardcore" Czech pro/am website features male strippers who get serviced by the female audience. Much of the action is three or more girls on one guy. The guys are often "passive" and the girls really are in charge.
There are lots of 2 girls-on-1-guy scenes in US sexvids, but that doesn't qualify as a gangbang.
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