>>103932774
Asian women have been found to have 10-20% smaller vaginal canals than Caucasians. Contrary to intuition, this is a genetic factor unrelated to height. A difference of 1m in height has an average affect of 0.1cm. Again, against intuition, age actually causes a retraction. The change is minimal however at -0.08cm/decade. Weight causes a stretching or gain of +0.02cm/10 kg. Menopause causes a retraction of -0.17cm. Each child they've had adds +0.18cm.
Generally speaking the length and width can vary quite a bit between women so the above factors don't translate to a significant difference. The only way to know is through first hand knowledge. That's why I can state definitively that Koseki Bijou has the tightest hole in Hololive.