Ashton Kutcher is proud of his "schwantz".

The US actor - who stars as a serial seducer of rich women in his latest movie 'Spread' - is happy for any of his colleagues to see his appendage, but did starve himself so his stomach would be flat for the film.

He said: "Once you do the first nude scene and the whole crew has seen your schwantz then you're fine.

"I didn't have to worry about diet. Pretty much I generally take on whatever is the abusive diet of my character. This guy pretty much didn't eat much, so he had this body."

Ashton deliberately set out to find a part where he could play a rogue akin to Warren Beatty in 'Shampoo' or Richard Gere in 'American Gigolo' and sought out the former to ask his advice.

Ashton added: "I definitely look up to Warren Beatty as an actor. So I sat down with Warren two years ago and told him I appreciated his work in 'Shampoo' and 'Bonnie and Clyde'.

"We sat down for breakfast, and I told him I was actively looking for a movie like 'Shampoo'.

"I told him I wanted to play a morally compromised charm artist. We talked about what he did in 'Shampoo' and where that character came from for him on an energetic level."

'Spread', which also stars Anne Heche, is released in the US and some European countries this month.