Louis Theroux was covered in cream by topless women at an X-rated party for his new documentary.
The broadcaster was blindfolded as he attended the dinner party for his new BBC series "Altered States", in which he explored multi-partner relationships in the episode "Love Without Limits", and he says revellers were "spasming in ecstasy" at the bash.
He told The Sun newspaper: "I felt like I needed to throw myself into it in order to show commitment and be respectful to the others.
"Everyone else was going way further than I was. There were people kind of spasming in ecstasy.
"There was a lot of nipple tweaking and one woman went round squirting whipped cream on her breasts and feeding the whipped cream to various people. That was one of those images you'll have in your head forever."
Louis admits his wife of six years , film director Nancy Strang, isn't the type to "get insecure", and she understood the father-of-three was there in a professional capacity.
He added: "She's a very understanding and cool person, not the sort of person to get insecure and in a flap about something like that.
"I don't even know if she was really listening. I don't remember what she said, probably something like, "By the way, you still haven't taken out the rubbish." "
While Louis was initially won over by the potential benefits of such a relationship, he wasn't too enthusiastic by the end of the documentary.
He explained: "A lot of it relates to new relationship energy - the idea that when you first fall for someone else after opening up your relationship you are bound to have a flood of endorphins and excitement and you'll be buzzing. And the old relationship just feels a bit left behind."
Louis Theroux's "Altered States: Love Without Limits" airs on BBC Two on November 4 at 9pm.