A California middle school teacher has been placed on leave after administrators learned from students that the educator appears in porn videos available online.

Stacie Halas, a 31-year-old science teacher at Richard B. Haydock Intermediate School in Oxnard, was removed from the classroom Monday, three days after pupils reported spotting her in a series of X-rated clips.

“Maybe it's not a crime as far as the penal code is concerned, but we feel it's a crime as far as moral turpitude is concerned,” said Jeff Chancer, superintendent of the Oxnard school district.

In a letter sent yesterday to Haydock parents, school brass noted that they are “asking teachers to discourage the children from searching for and/or visiting these inappropriate sites. We ask that you be particularly vigilant over the next few days with respect to the Internet content being accessed by your child on his or her telephone or other Internet-ready device.”

Halas can be seen in some of the videos engaging in a wide variety of sexual activity with a partner portraying a delivery man for “Big Sausage Pizza.” Instead of accepting a tip from Halas, the delivery man opens the pizza box and--surprise!--offers her a tip of his own (as seen in one of the below photos).

From there, the duo engage in a variety of sexual acts on the couch of Halas’s apartment. The action is filmed by a friend of the delivery guy who is, of course, shooting a documentary. The porn clips can be found on various web sites, including Sexbot.com.

Halas also stars in other explicit videos in which she uses the stage name “Tiffany Six.”

3/8 UPDATE: More on the very porny past of embattled teacher Stacie Halas