A 41-year-old Queensland woman who sent explicit pictures and texts to her son's 14-year-old school friends has been ordered to undertake community service.

The mother of three pleaded guilty in the Brisbane Magistrates Court on Tuesday to six charges of using electronic communications to expose a child under 16 to indecent material.

The woman from Brisbane's south can't be named to protect her victims' identities.

Prosecutor Maryam Yousufzai told the court the woman was 40 when she sent explicit pictures and text messages to three 14-year-old boys from her son's school between November 2012 and February 2013.

The messages were initially mild but became more explicit.