GOLDEN, Colo. - A woman who told police she wanted to be a “cool mom” pleaded guilty to sexual assault charges Monday for having sex with high school boys at parties where authorities said she supplied drugs and alcohol.

Silvia Johnson, 40, pleaded guilty to two misdemeanor counts of sexual assault and nine felony counts of contributing to the delinquency of a minor. As part of a plea agreement, prosecutors dropped two counts of distribution of methamphetamine.

“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.”’