Frekvensen av böjd joystick anges lite olika på olika ställen:
USA:
https://nypost.com/2023/07/04/nearly-10-of-men-suffer-in-silence-with-curved-penises-doctor/
Peyronie's disease är en orsak.
"Millions of men in the US reportedly suffer from a curved penis, but are too embarrassed to seek help due to societal stigma, a Texas urologist has cautioned."
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"Khera estimates that “up to 7% to 9% of men in the US” have this unfortunate curvature of the phallus. However, statistics indicate that this number is only around 1 in 100 as many men refuse to report the condition due to the humiliation factor."
Australien:
https://www.medicalnewstoday.com/articles/curved-penis
"Penile curvature is common and typically does not affect functionality. In a 2018 Australian study, roughly 1 in 5 males reported a curve in their penis. Of those, only 1 in 6 males noted an adverse impact of penile curvature in their lives, complaining of pain or discomfort when they had an erection."