A MARRIED mum has been accused of sexually assaulting a teenage girl while teaching her biology at church, it's reported.

Alisa Andrews, 50, was arrested on Tuesday amid allegations she molested the 17-year-old when homeschooling her in Arkansas, US.

3 Alisa Andrews, 50, was arrested on Tuesday amid allegations she sexually assaulted a teenage girl

3 Andrews taught the student biology at a church

The girl reportedly told police that Andrews had performed sex acts with her about 20 times over several months.

She spoke to cops after the pastor of the church reported a parent told him a teacher was in an "inappropriate" relationship with a student, according to an affidavit.

'INAPPROPRIATE RELATIONSHIP'

The document said the girl attended a home school program at the pastor's church, reports nwaonline.

She is also said to have spent time at Arkansas Public Theatre amateur dramatics company, which Andrews was director of.

On her Facebook page, Andrews, who has not yet been charged with any crime, has posted photos of a recent production of the Rocky Horror Show.

3 Andrews was arrested and released on bail

There are also pictures of her posing with her husband and children.

According to katv.com, the girl told police that she tried to end the relationship several times but Andrews threatened to kill herself.

The news site reports that the affidavit says cops found evidence including a handwritten note and several text messages that confirmed what the girl told them.

The age of consent is 16 in Arkansas, but adults in a position of authority over older kids can still face abuse charges for having a sexual relationship with them.

Andrews was taken to Benton County Jail, and has since been released on $25,000 (£19,000) bond.