A COLOMBIAN high school teacher forced students to have sex with her - and threatened to fail them if they didn't.

The 40-year-old teacher, known only as Yokasta M, groomed teenage boys at at an undisclosed school in Medellin, Colombia, by bombarding them with racy snaps between January and April 2016.

6 Married Yokasta M bombarded students with racy snaps

She allegedly asked up to 40 16-year-old boys for their numbers "to help with their studies".

But she then used WhatsApp to send the boys hundreds of scantily-clad snaps of herself in underwear or a bikini, sometimes only covering herself with hands or fluffy toys.

She then invited dozens of students back to her flat, ordered them to perform sex acts on her by threatening to fail their classes if they refused.

The sick pervert was finally exposed when a father of one of her victims discovered the snaps after checking his son's mobile phone.

6 Some of the x-rated pics show her protecting her modesty with just a teddy bear Credit: Canal4 News

Her husband has filed for divorce, and could face up to 40 years behind bars if convicted.

After her arrest, one of her students posted a cache of the x-rated images online.

He said: "This is the teacher Yokasta, who tells us that she disapproves of us if we do not have relations with her."

6 The married 40-year-old threatened to fail students who refused to preform sex acts on her

6 She initially asked students for their numbers in case she needed to help them with their "studies"

6 She was finally caught when the father of one of her victims found the snaps when checking her phone Credit: Canal4 News

6 She now faces up to 40 years in jail and her husband has filed for divorce

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