Students told to share gum during lesson on STDs

It was a novel class exercise: Ask a room full of Montgomery County high school students to take turns chewing the same piece of gum.

To demonstrate how sexually transmitted diseases are spread, a visiting speaker invited students to share gum in health classes at four county high schools in December and last month. School officials said a total of about 100 students participated in the lessons, although some declined to chew the gum.

Education and health officials say the gum exercise was unsanitary and should not have happened. The speaker and the clinic, a pregnancy counseling center with a religious orientation, are no longer welcome in Montgomery schools, school officials said.