Sarah Green, 25, was suspended from Stockport Grammer School in January after the clip was discovered by pupils.
The advert shows Miss Green playing a secretary who simulates sex with a builder.
The promotional video for a construction-wear company was never aired on television but was distributed around several building companies.
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However, the school are concerned that the scandal may effect how she is treated when she returns to work.
The school released a statement which reads: "In accordance with Stockport Grammar School's disciplinary procedures, the circumstances of Sarah Green's appearance in a promotional film before she became a teacher have now been fully investigated by a panel of governors.
"They have decided that nothing has been disclosed to them which constitutes grounds for dismissal or other disciplinary action.
"It has recommended that Miss Green should return to the school's teaching staff but has expressed concern about the degree of support she will need in order to function effectively as a teacher upon her return."
(CD/JM)
