The actor - who played Gollum in the fantasy trilogy and King Kong in the recent big screen remake - portrays the Blockheads frontman in Sex & Drugs & Rock & Roll, a new biopic about his life.
And Serkis was so determined to look the part, he endured lengthy gym sessions and waxed all of his body hair off in a bid to emulate the star, who was paralysed down one side.
But the actor's appearance didn't impress his wife, who refused to get intimate with him while he shot the movie.
He says, "I was determined to do anything I could do to inhabit Ian's body and bring him to life. I started working in the gym on his gait - literally hauling a dead left side with a strong right side - months before we shot it. I also had every single hair on my body waxed off. I am very hirsute to say the least.
"She (the beautician) started with my ankles. It was fine at first and I just read my script. Then she crept upwards. When she came to the inner thigh it was excruciating. There were blood blisters all over my legs and she had to do the most tender parts three times. Never again.
"Dury had a boyishness to his body. It was important to me to get it right. But my wife didn't like it. I'm afraid there was no sex - let alone drugs or rock and roll - for months. My wife didn't like the way I looked. I think it freaked her out a bit."