I was going to say isn't this an old story, so I had to open the link to check - yep, 2006. I don't think I can feel any sense of outrage over a story that old because I've known about it since then
What Nikki (or Helen) have done to earn money in the past, presently or in the future is their business, they are grown-up and make their own choices, just as any men who choose to use their services do.
I never had any problem with Helen's former choice of profession, nor did many others. Many have a problem with what happened afterwards - selling the story, etc., but at the end of the day he was the one who chose to use her services, nobody forced him. He must know that kiss-and-tell stories exist, he wasn't the first.
Any negative thoughts I have about Helen are solely to do with her behaviour on BB last year and this, plus anything I may have read on here about things she may have said on social media since. It's her that is objectionable, not her former profession.
ETA: Same goes for Nikki, obviously.