Kendra Wilkinson revealed she had sex with other men on the sly while the sexy blond was dating the low-libido hit Playboy boss Hugh Hefner.

The saucy ex Playboy bunny said: "I had to have sex every now and then, so I had to kind of sneak it," Hugh Hefner's 23-year-old ex told US Weekly.

Kendra said "of course" she had sex with Hefner, but not very often. She only saw the 82-year-old once a day and she never went on private dates with him.

However, speaking on the 'Girls's Next Door' programme, she revealed that Hefner's other ex, Bridget Marquardt, never cheated on the Playboy legend.

"Bridget told me that she's been faithful all these years, and I was like, 'How ... can you do that?'"

Wilkinson added: I had to have [sex] so I could feel my age, like a healthy human being."

Kendra also revealed that Hefner used to keep tabs on his three girlfriends which drove her "insane".

Stunner Kendra left the Playboy mansion in October last year and is now engaged to Philadelphia Eagles wide receiver Hank Baskett. However, she is soon set for a bizarre return - as the couple are planning to get married at Hugh's mansion!

The Playboy mansion is complete again as three new buxom blondes make up for the departure of Holly Madison, Kendra and Bridget Marquardt.

One of the three, gorgeous Crystal Harris, is a 34-25-34 psychology student, who has already be seen in a series of topless and semi-nude photos as a Co-ed of the Week on Playboy.com in October under the name "Crystal Carter."

The sexy 22-year-old Crystal said: “I am a good girl, for the most part.” Hugh Hefner may just be keeping extra close tabs now on her to make sure she remains that she is a good girl all of the time.

Ex-Baywatch babe Carmen Electra is back on the cover of Playboy, 13 years after the first time!