I reached out to Dr. Jennifer Berman, who specializes in sexual health, urology, and gynecology, in attempt to get to the ~bottom~ of this.
"It's not typical, but it can happen," Dr. Berman explained. "It could be caused by increased pelvic floor contraction during vasalva, which means the guy contracts his pelvic floor or kegel muscles that could cause an erection. However, there is no physiological explanation for erections and defecation to happen simultaneously. Straining down can cause hemorrhoids and vascular engorgement and trapping of blood in the penis, but it's not typical for erections to happen spontaneously during defacation."
There you have it, friends. It's not common, but not impossible either. The more you know!
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