ARVADA, Colo. – A 40-year-old woman faces charges of sexual assault and contributing to the delinquency of a minor for allegedly supplying drugs and alcohol to high school boys and having sex with some of them.

Sylvia Johnson, 40, told police she wanted to be a “cool mom,” according to an arrest affidavit.

Johnson did not immediately return a telephone message Thursday.

The arrest affidavit alleges Johnson had parties for the boys almost weekly between October 2003 and October 2004. The affidavit says she gave them marijuana, methamphetamine and a variety of alcoholic drinks.

“She described herself as a ‘cool mom,’ ” Detective R.J. Vander Veen wrote in the affidavit. He said Johnson told investigators “she was never popular with classmates in high school and now began ‘feeling like one of the group.’ ”

Jefferson County district attorney’s spokeswoman Pam Russell said she could not comment on whether Johnson has any children. If she does, they would be considered victims, Russell said, and state law shields their identities.

The affidavit accuses Johnson of providing drugs and alcohol to eight boys and having sex with five of them.

Authorities said the investigation began after one of the boys told his mother about the encounters, and she called police.

Johnson faces a preliminary hearing in February on two counts of sexual assault, eight counts of contributing to the delinquency of a minor and two counts of distribution of a controlled substance. She was arrested last