Today’s deep dive: the surprisingly serious science of penis size. Using self-report surveys, objective measurements, and a healthy dose of old-school statistics, we ask: How do you get clean data on gentlemen’s goods?Along the way, we explore social desirability bias, survey design tricks, and what happens when science meets insecurity. You’ll never look at a Starbucks cup the same way again.Statistical topics<ul><li>Social desirability bias</li><li>Selection bias</li><li>Volunteer Bias</li><li>Descriptive Statistics</li><li>Right-Skewed Distributions</li><li>Strategies to improve accuracy in self-report data</li></ul>Methodological morals<ul><li>“When answers aim to please, truth takes its leave.”</li><li>“Without descriptive statistics, you'll never know if you measure up.”</li></ul>References<ul><li>CROWNE DP, MARLOWE D. <a href="https://pubmed.ncbi.nlm.nih.gov/13813058/">A new scale of social desirability independent of psychopathology.</a> J Consult Psychol. 1960;24:349-354. doi:10.1037/h0047358</li><li>Gebhard, P.H. and Johnson, A.B., 1998. <a href="https://books.google.com/books?hl=en&lr=&id=s7dvxScuTWMC&oi=fnd&pg=PA1&ots=DpdMQV1JkI&sig=7VpacUvpcfKZRBlOODABWTioX1A#v=onepage&q&f=false">The Kinsey data: Marginal tabulations of the 1938-1963 interviews conducted by the Institute for Sex Research.</a> Indiana University Press.</li><li>Herbenick D, Reece M, Schick V, Sanders SA. <a href="https://pubmed.ncbi.nlm.nih.gov/23841855/">Erect penile length and circumference dimensions of 1,661 sexually active men in the United States</a>. J Sex Med. 2014;11(1):93-101. doi:10.1111/jsm.12244</li><li>Johnston, L., McLellan, T., & McKinlay, A. (2014). <a href="https://doi.org/10.1037/a0033264">(Perceived) size really does matter: Male dissatisfaction with penis size</a>. Psychology of Men & Masculinity, 15(2), 225–228. <a href="https://psycnet.apa.org/doi/10.1037/a0033264">https://doi.org/10.1037/a0033264</a></li><li>King BM. <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC8917098/">The Influence of Social Desirability on Sexual Behavior Surveys: A Review</a>. Arch Sex Behav. 2022;51(3):1495-1501. doi:10.1007/s10508-021-02197-0</li><li>King BM. <a href="https://pubmed.ncbi.nlm.nih.gov/32666897/">Average-Size Erect Penis: Fiction, Fact, and the Need for Counseling. </a>J Sex Marital Ther. 2021;47(1):80-89. doi:10.1080/0092623X.2020.1787279</li><li>King BM, Duncan LM, Clinkenbeard KM, Rutland MB, Ryan KM. <a href="https://pubmed.ncbi.nlm.nih.gov/30681032/">Social Desirability and Young Men's Self-Reports of Penis Size</a>. J Sex Marital Ther. 2019;45(5):452-455. doi:10.1080/0092623X.2018.1533905</li><li>Larson, R.B., 2019.<a href="https://journals.sagepub.com/doi/abs/10.1177/1470785318805305"> Controlling social desirability bias</a>. International Journal of Market Research, 61(5), pp.534-547.</li><li>Stodel, M. (2015). But What Will People Think?: Getting beyond Social Desirability Bias by Increasing Cognitive Load. International Journal of Market Research, 57(2), 313-322. <a href="https://doi.org/10.2501/IJMR-2015-024">https://doi.org/10.2501/IJMR-2015-024</a>   (Original work published 2015)</li></ul><a href="https://docs.google.com/spreadsheets/d/101qWTYWHT72tSuUi72xVW2d2IOEz0emepJArnrsEVgk/edit?usp=sharing">Spreadsheet with Penis Length Data</a>Our online courses and programs: <ul><li><a href="https://online.stanford.edu/courses/som-xche0033-demystifying-data-modern-approach-statistical-understanding">Demystifying Data: A Modern Approach to Statistical Understanding</a>  </li><li><a href="https://online.stanford.edu/courses/som-xche0030-clinical-trials-design-strategy-and-analysis">Clinical Trials: Design, Strategy, and Analysis</a> </li><li><a href="https://online.stanford.edu/programs/medical-statistics-program">Medical Statistics Certificate Program</a>  </li><li><a href="https://www.coursera.org/learn/sciwrite">Writing in the Sciences</a> </li><li><a href="https://online.stanford.edu/programs/epidemiology-and-clinical-research-graduate-certificate">Epidemiology and Clinical Research Graduate Certificate Program</a> </li></ul>Find us on social:Kristin - <a href="https://www.linkedin.com/in/kristin-sainani-642b5914/"> LinkedIn</a> &<a href="https://x.com/KristinSainani"> Twitter/X</a>Regina -<a href="https://www.linkedin.com/in/reginanuzzo/"> LinkedIn</a> &<a href="https://www.reginanuzzo.com/"> ReginaNuzzo.com</a><ul><li>(00:00) - Introduction
</li>
<li>(02:33) - Starbucks metric and episode themes
</li>
<li>(07:17) - Men and women’s sampling frames
</li>
<li>(09:24) - Kinsey and his studies
</li>
<li>(14:59) - Statistics quiz on Kinsey penis data
</li>
<li>(21:16) - Social desirability bias
</li>
<li>(28:23) - Cognitive tricks to elicit honest survey answers
</li>
<li>(34:16) - Condoms, honest penis lengths, and another stats quiz
</li>
<li>(40:36) - Objective penis appraisers, measurement error, and reliability
</li>
<li>(45:48) - Whose penises? Volunteer and selection bias
</li>
<li>(49:33) - Mini-meta-analysis and the “answer”
</li>
<li>(51:12) - Wrap-up and methodological morals</li>
</ul>

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