You have to be kidding... What stopped them from leaving was the "fact" that it was a mandated assembly. Faculty members were there. These kids TRUSTED their teachers and those who chose to have this "former stripper" perform for them. The students had no warning and attendance was not OPTIONAL. How many HS students would have gotten up and walked out? NONE, it appears. They thought this was a chance to learn how to keep yourself safe from AIDS which was still rather new on the scene at that time. They trusted their teachers. In addition to the "base/crude" content of the PERFORMANCE it was filled with untruth. Condoms do not prevent the spread of AIDS.
As to the family being EXPOSED to the content of Mass News...No harm there. The truth can be dealt with. It defends itself.