Melbourne, Jan 15: Former girlfriend of playboy founder Hugh Hefner, Kendra Wilkinson, has revealed that she cheated on him during her stay in the Playboy mansion.

Kendra has admitted that she used to sneak out of the mansion to have fun.

"I had to have sex every now and then, so I had to kind of sneak it," the Daily Telegraph quoted Kendra, as telling US weekly.

"Besides the nights we went out, I only saw Hef, like, once a day walking through the halls to his office. There were never solo dates, The most we kind of say to each other is, ''I love you,'' ''Love you too,'' ''I hope you have a good day,'' ''Did you have a good day?'' " Kendra added.

Though, the former playmate openly revealed her infidelity, she revealed that other two former playmates Holly Madison and Bridget Marquardt remained faithful all the years.

"Bridget told me that she''s been faithful all these years, and I was like, ''How the hell can you do that?'' I had to have (sex) so I could feel my age, like a healthy human being," Kendra added.

Kendra revealed that her life at the lavish playboy mansion was very confined as there was no freedom and Hugh's staff kept a check at the playmates outings.

Wilkinson, who announced her split from Hefner last October, and is now engaged to NFL star Hank Baskett, says she is still good friends with the Playboy founder. (ANI)