If I'm not mistaken, the 4th image is from a Japanese B-movie. The Zenra Movie Annex labels it as a "Battle Royale" style plot, with a girls school being taken over by soldiers, and the students are forced to perform sexual acts under observation by the school headmaster. Several teachers attempt to help the students overthrow their captors.
I recognise the clips posted as being from an early scene in the film, when the students are asked to strip by the (female) teacher by order of the headmaster.
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