She also sent one of the boys naked pictures of herself and invited one of his friends to have a threesome with them.

Dennis pleaded guilty to two counts of sexual penetration of a child under supervision and one count of sexual penetration of a child under 16.

She was convicted and sentenced to four years and three months' jail, with a minimum of two years and 10 months to serve.

Judge Susan Cohen described the offences as "serious" and said she had shown little remorse for her actions.

"Teachers have a high ability to influence students and that gives them a responsibility not to abuse their position," she said.