Did I get stiffed?

While working sporadically on a longer post, this question came up. Suddenly it hit me---Hey, I'm a blogger! Figured I might as well toss this quandary into your formidable laps.
Let's say that I've been doing a theoretical poetry residency in a rather tony high school in a rather tony theoretical suburb just past, theoretically, Manhattan. The 11th-graders are theoretically typical--tethered to their cell phones, swathed in spandex, sporting tattoos, gleefully potty-mouthed, indulging in quick, furtive blowjobs in the back stairwells. You know, the usual.
I'm teaching persona poems, which I love to teach because kids nowadays have no boundaries. No one's told them yet that their imaginations will grow numb then wither into further numbness. They still got dreams, dammit.
So after I explain the concept of stepping into other shoes and writing from other perspectives, after I assure them that they can take on the persona of absolutely anything, one of the cagey little imps comes up with a poem in the voice of a penis.

Theoretical hell breaks loose.
OK, let's get this straight (no pun intended). The theoretical penis poem was clever, discreet (with the exception of one line, which I won't repeat here) and pretty well-written. It was a perfect illustration of what I'd been talking about, and I saw no reason whatsoever why he shouldn't share it with the class. After all, I suspected they'd all passed Sex Ed with flying colors, during which they probably stumbled upon the word, and the guys in the room were actually in possession of the genuine article.
The theoretical class was, for the most part, very adult about it. A few of them had trouble guessing the persona (that's how discreet it was), but the near-misses were hilarious. Midway through the spirited recitation, I noticed the teacher in the back of the room, his middle-American mug hurtling through a series of tortured contortions. At one point, I think he drew a pointer finger across his throat in the classic "Oh God, please stop it now" gesture.
The theoretical kids and I went on an enthusiastic discussion of the phallic stanzas, while Mr. Teacher slowly simmered. Once the bell had buzzed (or was this one of the schools where the buzzer rings?), he pulled himself together long enough to make this one defiant statement: "Nothing gets read in my classroom unless I read it first."
Huh?
He went on to explain that the creative kid in question often took great pains to bring attention to himself. (I don't know any poets who fit that description, do you?) Yeah, alright. Understood, but the poem was pretty good. The kid had grasped the concept. And--listen up, cause this is important--for the 40 minutes of that period on that particular day during that particular theoretical residency, it was my classroom.
I'd followed the rules discussed in advance. No expletives (insane in this age of back stairwell you-know-whats, but whatcha gonna do?), no overt sex (the penis didn't do anything, it just was), no poems about clowns (that's my rule--don't ask). I'd theoretically agreed to come in and do what I do, and that's exactly what I was doing.
So, for those of you who do work in schools, here are my queries: Was I wrong to have the student read the relatively tasteful penis poem without first checking with Mr. Teacher? When you come in a classroom to do what you do, do you feel free enough to do it? And, especially when you've been working with a certain group of kids over an extended period of time, shouldn't you be able to consider the classroom your domain for the time you are there?
This situation is soooo theoretical. I'm just curious what you guys think.
In other news, one of my Cave Canem students recently penned an ode to her womb. But that's another story...