Like most myths, there’s a strong element of truth behind it. Fraternity parties were bacchanalias. The problem is that this was no mystery, and was precisely why people went to them. There would be drinking. There would be dancing. There would be sex, if you were lucky. Debauchery? It could happen.
The difference wasn’t that women were unaware of the fact that they were going into the lion’s den when they decided to try their hand at being Sigma Chi’s sweetheart, but that the sexual revolution was on, and if women wanted to drink, to get drunk, to have sex, so what? The fight wasn’t over sex or no sex, but the chauvinist belief in the virtue of the virgin.
If a woman chose to have sex, that was entirely her business. She was no more a slut than the guy. That, at the time, was the radical shift. Women with adult prerogative. Women with the right to do whatever the hell they wanted to do, even unmarried sex, without fear that she would be tainted in perpetuity as a harlot. It was revolutionary. It was long ago.