Harvard University hosted a sex workshop aimed at teaching students the joy of anal sex.

The seminar was hosted by local adult shop Good Vibrations in Cambridge, Massachusetts and is part of the top US college's sex week, which runs from November 6 to 12 and is designed to promote open and honest relationships.

The talk on Tuesday (7 November) was called 'What What in the Butt: Anal 101', but throughout the week other courses are on offer such as 'Sex Toys 101: Feel Those Good Vibrations' and 'Exotification, Sex and Race'.

Around 50 students attended the anal sex workshop, according to college paper The College Fix, where they learnt to handle butt plugs, anal beads as well as how to avoid infections.

Natasha, who hosted the workshop said the key to good anal sex was: "Practice, practice, practice."

She added: "The butthole is the great sexual equaliser. All humans have a butthole."

The workshop described anal sex as a "tantalizing taboo", with Natasha adding: "There are two types of people in this world, people who watch anal porn and dirty f***ing liars."

The workshop leader said the aim of the talk was to "encourage people to go after their desires and not feel shame." But the seminar also covered how porn gives people unrealistic expectations of sex.

Former President Obama, whose older daughter Malia attends Harvard, repealed a ban on consensual sodomy in the Military in 2011. However, a dozen states still have anti-anal sex laws on the books including Louisiana, Mississippi, Idaho, North Carolina, South Carolina, Utah and Florida.