Also known as: これ絶対入ってるよね, 性暗示(已发生)
When sexual intercourse is implied to be taking place, but is not immediately obvious due to not being shown explicitly on the image, such as the penetration being obscured or that only the character dialogue is present and is hinting that sex is taking place.
When the character is clearly being shown to have been sexually penetrated but the source of penetration is not shown (such as being out of the frame), simply tag Sex instead.