Roache - who plays Ken Barlow in the ITV1 soap - recently spoke about his womanising ways on Piers Morgan's Life Stories, revealing he once had an affair with co-star Pat Phoenix.
The 41-year-old weathergirl, who started dating the 79-year-old in November 2010, insisted to Hello! magazine: "He did sleep with a lot of girls but that was back in the 1960s.
"If he was like that now, I wouldn't be with him. And if he did resort to his old behaviour, I'd cut it off."
Elaborating on the nature of their relationship, Jesson added: "Our lives are so busy that relaxing at home is our ultimate treat. While Bill learns his lines or listens to the cricket, I read a book or prepare a meal.
"We feel completely at ease with each other. He doesn't look or behave like an 80-year-old. To me, he's still young."
Roache lost his second wife Sara in 2009, after the mother-of-two died suddenly of a heart attack aged 58.
> Corrie's Bill Roache 'overwhelmed' at reaction to sex life revelations