Playboy boss Hugh Hefner is already having trouble with his new girlfriends, twins Karissa and Kristina Shannon - he can't tell them apart.
Hefner hooked up with the 20 year olds after long-term lovers Holly Madison, Bridget Marquardt and Kendra Wilkinson all flew the nest from his Playboy Mansion last year .
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But the aging Lothario is already finding downsides to dating identical twins.
He tells Fox News, "I have one little trick, one has a little mark (on her neck).
"Other than that, I don't know."
