This is an adult male and he feels fear, disillusionment and “broken spirit” when he sees some girl give oral sex?
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I think this science teacher felt betrayed by some of his students...He thought his students were great...He probably trusted them...
A teacher should not be too idealistic...A teacher also should not be too cynical...
Maybe this incident will convince this science teacher that he should not be too idealistic...
I taught high school long ago, about 40 years ago. If this teacher thinks the students are not having sex, he .just be the most naive person on the planet.
His students may be great but that doesn’t mean they are not doing it.