Usually these types of parties are horribly disappointing to me. The professionals are usually the only ones engaged in any hardcore activity. The real amateur girls just stand around, dance and flash their tits and pussy, make out with each other and the strippers a bit. There's always some brief handjobs from them, and a few quick sucks on a cock. Occasionally you get a girl who's drunk and horny enough to get down on her knees and give a random stripper a nice long blowjob. And very, very rarely you get a girl who gets bent over and fucked by a stripper.
That's what happens here. She's drunk and horny, making out with a stripper. She strokes his cock, while he fingers her cunt. Then she decides that she'll bend over and let him fuck her, if only for a few minutes (and with a condom).
Unfortunately, there's no way to tell the real amateur from the planted professionals, so I don't know if she's actually an amateur. She just seems like one to me. Especially if you watch her reaction in the video, much more real than the pros. And she doesn't do anything for the rest of the party, just sitting and standing around the edge of the party. Occasionally clapping and cheering. I really want to hear other peoples comments on whether she's real or a pro though. And share other pics of seemingly real girls fucking at stripper parties!