I spent a total of eight years at two different universities, lived both in and out of residence and was an active member of a fraternity during my undergraduate years. So, if that is what you mean by the 'real college experience', then I qualify as having had it.
Gangbangs as you describe them (two girls with 6 or more guys) were certainly not part of my university experience. I mean, party nights at the frat house saw a helleva lot of fucking going on in the rooms upstairs, but not gangbangs. It was almost entirely one-on-one. Two or three brothers tag teaming a girl did occur but it was rare occurrence and, I hasten to point out, it was entirely consensual on the girl's part. Thankfully, some sluts and nymphos attend university too