Kendra Wilkinson didn't know sex was involved when she joined Hugh Hefner

Washington: Kendra Wilkinson has revealed that when she moved into Hugh Hefner's Playboy Mansion at the age of 18, she didn't know sex was involved.

The 29-year-old TV personality said in a clip that she knew nothing about Playboy, she had just graduated high school, but when the Playboy creator invited her to come upstairs, she went and had fun, ABC News reported.

However, the 88-year-old Hefner, who considered his relationships with the women who live in the mansion as "real relationships," was understanding when she came to him and told him that she planned to marry her husband, Hank Baskett.