Mila Kunis has compared Ashton Kutcher's manhood to a "carrot stick".

When faced with a choice between a tiny slice of the orange vegetable or a beer can, or if she didn't want to answer she could drink a revolting beverage as a punishment, Mila said: "Oh my god, what am I going to do?"

After contemplating whether to drink one of the vile concoctions, she said: "I have to have one or the other? OK, carrot stick."

James and Mila's 'Bad Moms' co-star Christina Applegate, who was also playing the game, immediately fell about laughing, and he said: "Hang on, carrot stick?!"

The 32-year-old stunner replied: "But beer cans are short?"

He then said: "No, no. Big beer can."

Mila soon changed her mind, saying: "Oh, beer can, beer can!"

It's not the first time one of Ashton's girlfriends has publicly described his private parts.

In 2008, Brittany Murphy - who sadly passed away in December 2009 - appeared to reference his piece when making a joke about his relationship with Demi Moore, who he was married to from 2005 to 2013, on 'The Late Show with David Letterman'.

She quipped: "To him age doesn't matter and to her size doesn't matter."

The blonde star then added: "Kidding!"