face to crotch correlation

phenomenon. The uncanny ability for a OBGYN to distinguish a ladyboy from a lady after years of associating faces of patients with the appearance of their crotch. The expert is even able to predict the gender of a ladyboy of thai tranny caliber.

Dr. P: Wtf how did u score a 90% on the ladyboy test?
Dr. S: oh it's easy her face to crotch correlation was a 7 favoring a woman.
Dr. P: ...