Former teacher Christy Lee Smith will spend at least 20 years in prison for having sex with two students, a judge ordered Wednesday.

Smith "preyed" on the boys, who attended schools in different Lancaster County school districts, while teaching English at McCaskey High School between 2008 and 2010, Lancaster County Judge Dennis Reinaker said at her sentencing.

The victims were 15 and 17 when Smith, 34, committed the crimes, according to trial testimony.

"There are some who wrongfully believe that situations such as this don't truly have victims," Reinaker said. "That because it involved a female adult and male teenagers that it's less serious than those where the situation is reversed.

"That is simply not the case."