When the events that led to this case occurred, respondent taught seventh-grade life science, using a textbook that had been approved by the School Board. The textbook included a chapter on human reproduction. During the 1978-1979 school year, respondent spent six weeks on this chapter. As part of their instruction, students were shown pictures of respondent's wife during [477 U.S. 299, 301] her pregnancy. Respondent also showed the students two films concerning human growth and sexuality. These films were provided by the County Health Department, and the Principal of respondent's school had approved their use. Both films had been shown in past school years without incident.