cross-section
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This tag is used primarly for two things:
- For the neutral/common meaning of cross-section, such as Danbooru post #462991;
- For when the act of sex is shown in a separate frame to show the internal anatomy of the participant(s). For example, a depiction of vaginal intercourse where the vagina, cervix, and uterus are visible.
Use x-ray instead of this tag for when the internal anatomy is visible through the body as if by x-ray vision, as opposed to being drawn in a separate frame.