This was the generation, after all, that reinvented America as Amerika, based largely on their perception of its repressed sexual culture. There is something desperately wrong with categorizing people, especially older people, according to sexual appetites and practices. It is brutally nosey, to begin with. Now, we're talking about 91 years old here. I think it would surprise a lot of people.
Polls are notorious for eliciting false information and sex surveys in particular.
Maybe she just wanted to have a little fun at someone else's expense. Or maybe she was feeling competitive. On the other hand, maybe that's the point. By reducing sex to a statistical sample, we declaw it, we make this innate and powerful experience into a mere activity, like volleyball, bicycling and eating right. We are reducing sex to an aerobic moment, a session on a horizontal Stairmaster.