Yes it's unprofessional. Depending on the rules of your office, it may even be a fire-able offense.
But only IF you're caught.
Honestly, if anyone's temperament could get readjusted by a good porking, it's yours. So why don't you take a play from the liberal playbook & go and get your **** wet. It'll be good for you, good for us, & while it'll probably be the stuff of nightmare's for her- SOMEONE needs to take one for the team, why not her?
"The Rich are there to take all of the money & pay none of the taxes, the middle class is there to do all the work and pay all the taxes, and the poor are there to scare the crap out of the middle class." -George Carlin