Even though Hugh Hefner passed away in 2017 at the impressive age of 91, the intrigue around him and his Playboy empire remains strong. Many people are still very eager to learn about the real happenings in his infamous mansion over the years.

As is well-known, Hefner became famous as the founder and editor-in-chief of Playboy magazine, eventually expanding his venture into a multi-million dollar industry.

He was at the center of numerous sexual assault allegations, and amidst these scandals, many women who lived with him at the mansion have spoken out about their experiences.

This is especially true for individuals like Holly Madison, who was in a relationship with Hefner from 2001 until 2008.

Ex-Playboy model, Holly Madison, once opened up about a very strange object she found in Hugh Hefner's mansion (Michael Bezjian/WireImage)

Over the years, the former Playboy model has been very open about her intimate life with Hefner, revealing details about his 'hellish' sexual routine, the 'unpleasant reality' of their home life, and even a 'common misconception' about the magazine mogul.

She also once disclosed the peculiar sexual item Hefner used, in a startling bedroom confession last year alongside fellow former Bunny, Bridget Marquardt, on their Girls Next Level podcast.

Madison and Marquardt, who was also among Hefner's numerous girlfriends, reminisced about their time at the mansion and remembered their reactions upon discovering a dedicated 'sex chair'.

Referring to what is known as the 'Cover Girl Murder' - when Playboy Playmate Dorothy Stratten was killed by her estranged husband - Madison described seeing an unusual piece of custom-made furniture at the mansion: "The sex chair was this strange chair someone crafted in the Seventies. Dorothy Stratten’s husband was attempting to get it patented, or he was involved in a business that made them or something.

The former Playboy housemates recalled finding the 'weird' sex chair (Denise Truscello / Contributor / Getty Images)

"There was one at the mansion in the bath house area …there was no gym back in the Seventies, but there used to be a sex chair there. They mention it in Secrets of Playboy about how some people enjoyed using it at parties – a really gruesome detail is that in the Dorothy Stratton murder that was part of the whole thing…"

And, on the topic of strange sexual matters, Madison mentioned to BuzzFeed News a decade back in 2015 that the frequent sex parties always occurred on the same two days of the week.

"It was consistently Wednesdays and Fridays after the club. It was always exactly the same because that's just how he preferred to live his life," she stated.

According to Madison, all of Hef's girlfriends were expected to participate, as she explained: "They knew it was kind of a quote-unquote requirement for living there, and expected.

"And it had somewhat of a chore-like atmosphere, I felt."