Jimmy Saville seems to have sexually assaulted hundreds of children under the age of consent, including children who were disabled and in the care system. It also appears senior management within the BBC colluded with the abuse. In those ways, his situation is different from that of John Peel and Bill Wyman.
However, I don't accept the fact that Mandy Smith or the girls John Peel had sexual contact may have said they wanted to have sex with them means it wasn't abuse. It was still abuse.
I do work with young people and with increasing frequency, encountering girls of 13 or 14 who are being sexually abused, but they don't always see what is happening as wrong. They've been "groomed" into it by older boyfriends or slightly older friends. They get phone credit, alcohol, cigarettes, drugs and kudos from performing sex acts on groups of boys. They rarely see it as abuse, but then when you talk to them, even at a young age, they already believe that sex is something you have to do for boys to have a boyfriend/not get beaten/be accepted by your peers/etc. It doesn't occur to them that sex is for anything but a man's pleasure. For many girls, they believe being sexually available for men is about all they are good for.
In the Rochdale sexual abuse case, social workers were criticised for saying the girls were making a "lifestyle choice" by having sex with much older men. In a similar way, some folks say that because the girls Peel and Wyman had sex with said they wanted to have sex, that they, too, were making a lifestyle choice. Too often, girls having sex under the age of consent are seen to just be "streetwise," rather than victims of abuse. No, they won't necessarily invite help, but that doesn't mean that we should just assume all is okay and ignore them. We let them down in a BIG way if we do.