I read about this one a few years ago. Apparently they did a study, and if you’re not getting enough sex, the discs in this one may appear to be rotating slightly. If they’re rotating a lot, you’re probably a virgin — or at least haven’t had sex in several years.

Apparently, it has to do with the particular combination of phenylethylamine and serotonin that is released during sex. If the brain is starved of this chemical male reproductive organtail, a kind of brain damage occurs in the visual cortex, so that you are unable to focus steadily on the still image, and the discs appear to swirl. I wonder what it looks like?

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