“Corrections to Last Month’s Letters to Penthouse Forum,” by David Copper:

In the letter “Three-Way Freeway,” it was implied that “Diana” begged for the opportunity to participate in sexual relations with her roommate and her roommate’s boyfriend after accidentally walking in on their “sweaty, all-night lovemaking session.”  In actual fact, “Diana” was not aware of her participation in the “love sandwich” until she regained consciousness later that evening.

Courtesy of McSweeney’s, of course.