According to an article by Francis Baumli in the May 1991 issue of Men's Health Newsletter, testicles that disappear into the groin during sex or extreme fright can be quite normal in some men and are not necessarily a symptom of a hernia, though the men affected may be considerably worried about what is happening. What happens is that the cremaster muscles, one attached to each testicle, pull the testicles up into the inguinal canal. The article concludes with the paragraph:
Furthermore, according to physical anthropologists, it's likely that Neanderthal and Cro-Magnon man had a cremasteric reflex strong enough to pull the testicles up into the body during fight or flight. Even today, martial artists in some disciplines practice raising their testicles until they can voluntarily pull them up inside the inguinal canal where they are (supposedly) less likely to be injured during a fight or sparring match.
And I thought I had total control of my body when I learned to wiggle my ears.
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