Robert Newbiggins, who was born an "intersexual", meaning he has both male and female genitalia, has spent decades roughing it in the ring, even training with boxing legend Ricky Hatton.
But Rob, 44, has decided to temporarily swap the gloves for a gown, in a bid to forge a modelling career in the States.
Speaking from his home in Southport, Merseyside, Rob said: "I've always wanted to be a woman, ever since I was three-years-old.
"My dad instilled in me from an early age that I needed to be masculine.
"He said it was wrong to be an intersexual and that I needed to act like a man.
"So I took his advice, everything I have done in my life since has been masculine.
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This is a service of the Organisation Intersex International