A 37-year-old Bible-class teacher at a private academy has been arrested for allegedly creating a "secret society" to lure teenage girls to have sex with him, the San Antonio Express-News reports.

Robert Louis Rosseau, who taught eighth-graders at Christian Academy of San Antonio, was charged with aggravated sexual assault.

The principal at the academy said none of the alleged sexual acts took place on campus and that only one of the three girls involved attends the school, the paper says.

Rosseau's secret society, which included him and two of the girls, came to light when a third teen resisted joining the organization, which they referred to as an "order," and discussed it with friends.

The paper says that the arrest affidavit quotes the two girls as telling the potential recruit that she had to be "intimate" with Rosseau to become a member and gain his trust.

The affidavit says Rosseau would read Bible passages to the two girls "to legitimize his believed ability" to have sex with them, the Express-News says.