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A lecturer has been accused of going way over the top while teaching students about safe sex - after demonstrating how to put a condom on with her mouth.

Footage of the woman getting on her knees and putting the condom on a plastic penis held by a shell-shocked male pupil has provoked outrage after it emerged in Brazil.

His classmates rolled around with laughter as the X-rated practical demonstration was carried out.

It is believed to have been filmed at a university in Bahia, in the north east of the South American country, but this has not been confirmed.

No-one in the classroom looked particularly shocked as the brunette showed her seeming expertise with the questionable demonstration.

(Image: Z Diesel/Youtube) (Image: Z Diesel/Youtube)

The uncertainty surrounding exactly where the footage was taken didn’t stop leading Brazilian politicians wading in to criticise what they were doing.

Flavio Bolsonaro, state MP for Rio de Janeiro since 2003, tweeted as the footage started to go viral in the South American nation: “Should a teacher pretend she’s (performing a sex act) so she can put a condom on?”

The footage started with the woman at the centre of the controversy saying: “I’m going to do a practical demonstration for you” with the fake penis in her hand as a group of male and female teenagers gathered round.

She went on to place the contraceptive strategically in her mouth to whoops of delight before grabbing the nearest male and continuing the demo.

(Image: Z Diesel/Youtube)

Several of the youngsters could be seen filming what they were seeing with their mobiles.

Local Rafael Esteves took to social media to say: “Congratulations to that teacher. Showing the girls how not to catch sexually transmitted diseases.”

But a critic of the class added: “Only in Brazil could things like this happen. For me this is a tremendous lack of respect towards education and society. Schools and universities should be a place where subjects like maths and Portuguese are taught, not this s***.”