I’m not 100% certain that this artwork is by Peter Fendi, but it sure looks like it to me:

What an astonishing fleshpile! You can’t tell the players without a program, but here’s what I see: One very busy man being fellated by a woman whilst another is rimming him, or at least licking his bottom. Meanwhile, he’s got a third girl up in the air where he’s licking her pussy. She, in turn, rests on the shoulders of another person (man?) who is having his (?) anal region licked by woman #4. These people take their orgies seriously!