What is the acceptable 0.0000000001% of the time?

I don't know, Tommy Lee. I've never seen it. But I guess there might be a sweet female-run, feminist strip club out there somewhere, so I guess it's wherever that is.

Male strippers aren't terribly demeaning to women, and I believe they account for more than 0.0000000001% of the market.

A clothed pep rally lap dance is in poor taste but hardly a solid reason to fire an otherwise good teacher. Good teachers are precious, and this mistake is not so extreme as to justify throwing two away. If they aren't good teachers, they should be fired for that reason.

Those people have either been way too much time around teenage girls (and, sadly, that's just the kind of stunt some airhead would pull to boost her popularity), or are educational geniuses, who have finally found an effective punishment for their students.
So keep those iPhones off during class, kids, or the basketball coach, the vice-principal and the math teacher will perform a Chippendale's routine!

Seminymous, part of the definition of a "good teacher" is one that sets a good example for kids while helping them learn and mature into responsible adults. Doing a frakkin' lap dance at a pep rally is way outside the scope of their duties and they should be canned.

Regardless of what kids these days (typing that just made me feel 80 years old) see on their own time, there is enough shit going on a schools now that they shouldn't be exposed to this in an institution of learning.

At the risk of sounding all devil's advocate-ish here's what I think: teachers today spend most of their time trying to be "friends" as opposed to role models or authority figures. They bend rules in order to be more sympathetic to students. They ACT more like students in many situations (like this) and I don't think the students mind. I don't think many parents mind, actually. Whether or not that's appropriate is entirely up to the individual. I personally think they're being utterly stupid, but I don't think that because it offends me. I think that because it offends other people.

I'm going sort of off topic here. Regarding firing them versus other punishment, how does one judge the quality of a teacher? A good teacher can have a class full of lazy (and consequently failing) goofballs. Should the teacher be punished?

As a high schooler myself, I'd be insulted if a peer decided to try to pull that shit at a pep rally. If a TEACHER did it, regardless of appropriate content etc. etc. the fact that they do not have the judgement to think, "Oh, wait, feigning oral sex in front of my students is maybe not the best thing for my own career", I'd be disgusted if my school didn't take action. The few teachers in my district that I know would be coerced into doing this--even as a joke--are awful teachers and SHOULD be fired. My art teacher is certianly a close friend of mine, and if he did that? Not to be a stereotypical high school student but... FRIENDSHIP OVER. Have some dignity.

Also, in regards to Admiral, I do admittedly go to a pretty well-disciplined school. But the few teachers I've had that have lost all control of their classes are NOT good teachers. Teaching is not only about how much the teacher knows about their subject but also about how they are able to discipline and control their classrooms. If they're super smart but totally incapable of keeping a bunch of 15 year olds in control, they should be a professor, not a high school teacher.