Crystal Harris: Sex with Hugh Hefner ended just in 'Two Seconds

Crystal Harris is moving on from Hugh Hefner, but not without taking a few parting shots at her past fiancé. 

Harris, 24, said Tuesday on Sirius XM Radio's Howard Stern Show that sex with the 85-year-old Playboy founder ended "like two seconds." 

"Then I was just over it," she says. "I was like, 'Ahhh.' I was over it. I just like, walked away. I'm not turned on by Hef, sorry." 

She includes that they had sex only on one time. 

He doesn't actually take off his clothes," Harris says. "I've not at all seen Hef nude."  Now that Harris has parted ways from Hefner, she is passing a great deal of time with Dr. Phil's son Jordan McGraw. 

Even though rejecting a reported relation with the songwriter in June, Harris was spotted out with him just at Knave, the upscale and dimly lit bar at Le Parker Meridien in NYC. 

They were connected by two women who stayed for about one hour," an observer tells PEOPLE. "Crystal was drinking mojitos and laughing, and Jordan was sipping a drink on the rocks. But once their friends left, they actually settled in and appeared more and more contented.