Multiple Os

The Prostate Ruler is a practical, rule-of-thumb guide designed to compare finger and toy lengths to the typical range of prostate depths. Given the significant variation in individual anatomy, creating a universal tool is challenging. The most relevant data available comes from studies measuring physician finger lengths used during digital rectal exams, which simulates a toy decently well.

To effectively stimulate the prostate, a toy typically needs to reach a certain depth and angle upward to apply direct pressure—unless it relies on girth or active kegel engagement.

The printable file can be accessed here.

References:

Koulikov, D., Mamber, A., Fridmans, A., Abu Arafeh, W., & Shenfeld, O. Z. (2012). Why I cannot find the prostate? Behind the subjectivity of rectal exam. ISRN Urology, 2012, 456821. https://doi.org/10.5402/2012/456821

Calleja, E. (n.d.). Prostate anatomy & function. Retrieved July 10, 2025, from https://www.edwardcalleja.com/blog-posts/how-to-maintain-a-healthy-prostate-getting-to-know-the-prostate

National Biorepository of Ireland. (n.d.). Prostate gland anatomy. Retrieved July 10, 2025, from https://www.nbir.ie/prostate-gland-anatomy

Rupa Health. (n.d.). Digital rectal exam (DRE): The ultimate guide. Retrieved July 10, 2025, from https://www.rupahealth.com/post/digital-rectal-exam-dre-the-ultimate-guide