I would have to say yes. To me, it falls in the same boat as people getting fired for being on the phone too much, too many visitors, or being on the internet too much. I understand there is a thrill or rush of maybe getting caught, but try to control yourself or get a room on your lunch break. You get paid to work, not for extracurricular activities. (If I can't get none, you can't either!

)
I would be afraid the tape would end up on one those "Caught on Camera" shows. I could never live that down.