Since the Kinsey study used cardboard index cards, I doubt it was totally bone pressed, BUT the subjects self measured, so IMO, the fudge factor probably equates to BP measurements. But thats just my opinion.
For the Durex study, it was again self measured, so who knows how they measured and how much fudge factor was involved.
The Lifestyles survey thatthe article mentions was BP, I'm pretty sure. I don't know if this article says, but I'm pretty sure I've read that it was BP. Plus it was done by professional nurses, so at least the method was consistent.
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