updated 11/15/2005 8:01:39 AM ET 2005-11-15T13:01:39

A woman who authorities said had sex with high school boys during alcohol- and drug-fueled parties has been sentenced to 30 years in prison, officials said.

Silvia Johnson, 41, of Arvada, described herself to investigators as a “cool mom” who “was never popular with classmates in high school” and who was beginning to feel like one of the group.

She pleaded guilty in July to two misdemeanor counts of sexual assault and nine felony counts of contributing to the delinquency of a minor.

She also was sentenced for additional charges of third-degree assault, violation of a restraining order and harassment for unrelated cases involving her husband and children, prosecution spokesman Carl Blesch said.

Authorities said Johnson held parties for the boys almost weekly between October 2003 and October 2004. They said Johnson provided drugs and alcohol to eight boys and had sex with five of them.

Johnson was to be sentenced on Sept. 26, but the hearing was postponed after she was injured the day before while riding in an SUV that veered off an interstate.

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