DES MOINES, Iowa -- Some University of Iowa students may be able to get an "A" in X-rated. The school will be offering a class on porn in the fall semester. All 20 student slots have been filled and there's a waiting list. Grad student Jay Clarkson is teaching the course. But he cautioned that students looking for a cheap thrill will be disappointed. He said no films or other explicit material will be shown in class. Clarkson said the class will examine the impact of porno on mainstream culture. But Iowa House Speaker Chris Rants doesn't like the idea...