Viewers cringe over Louis Theroux's naked polyamory dinner party

Titled Altered States, the first episode looked at Love Without Limits as Theroux observed the rising trend of polyamory.

• New Louis Theroux BBC2 documentary will examine life, love and death
• Louis Theroux has curated a collection of his favourite BBC documentaries – and they're all available on iPlayer
• Louis Theroux documentary archive heading to BBC iPlayer

Never one to shy away from the more graphic sides of his subjects (who can forget the legendary Swingers episode from his Weird Weekend series?), the 48-year-old stripped off for a for a 'sensual dinner' at a polyamory party.

https://www.youtube.com/watch?v=1zqd85d68S4

Hosted by Sex Positive Portland, the party lets participants explore open relationships by engaging in giving and receiving pleasure with others.

Discussing his decision to take part in the dinner, Theroux explained, “After having run it past my wife, I went to an event run by Sex Positive Portland.

“Dedicated to building deep, emotional connection, the group’s members are mostly in non-monogamous relationships. Details about the events were vague, but it had something to do with eating.”

But the nature of the evening quickly became clear to the veteran documentary filmmaker, who was informed that while the blindfolded guests weren’t allowed to “inappropriately” touch each other, kissing and stroking was encouraged.

While his guests fully immersed themselves in the supposedly sensual experience, touching and rubbing one another, Theroux just tucked in to the dinner.

Fans of Theroux took to Twitter in their droves to comment on the highly awkward scenes.

https://twitter.com/MichaelM238/status/1059201322438848518

https://twitter.com/bobbybalmoral/status/1059201752891904000

https://twitter.com/crisrodrix_/status/1059197047323217920

The next in Theroux’s documentary series is titled Take My Baby, where he will observe mothers who put their newborns up for adoption.

The final episode of the trilogy looks at euthanasia and assisted dying.

Speaking on why he picked these topics for the new series, Theroux explained to the BBC, “Altered States was an attempt to take a look at the most intimate and most difficult sides of life (birth, love and death) in an American context, and specifically ways in which these issues are being handled differently.

"Over the years it has taken time to earn the right to tell stories that are very stressful, intimate and difficult. I’ve come from a background where what I was doing was quite tongue in cheek. To go from that into stories about trauma, involving very vulnerable people... it was just a case of learning how to do that gradually.”

Louis Theroux’s Altered States continues Sunday at 9pm on BBC2

Sign up to the RadioTimes.com email newsletter