FCVR-060 NBTI: Is a Foreskin More Introverted? Is a Fully Exposed One More Extroverted? Personality Diagnosis Based on Penis Shape by Shiori Kuraki
Hi, everyone, how are you doing? It’s Shiori-sensei! Today I’m going to explain the NBTI personality types!
NBTI stands for the Natural Erection Type Indicator, and it is a scientifically grounded assessment method that classifies people into 16 patterns based on four dichotomies: covered type (I) and uncovered type (E), straight type (S) and curved type (N), neutral type (T) and enhanced type (F), and firm type (J) and soft type (P).
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FCVR-060 is one of 165 videos featuring Kuraki Shiori (倉木しおり).
Her most frequent collaborator is the maker K.M. Produce, which produced about 7% of her total works.
For a full list of Kuraki Shiori’s works, see the Kuraki Shiori JAV playlist .












Video Information
Release Date:2026-01-13
Product Code:FCVR-060
Series:
