This is an interesting story of love (?), sex and spy, between a French diplomat and Beijing opera singer. Both male but Shi was able to convince Boursicot that he’s a female and gave birth to his son.
Reporter Joyce Wadler, who wrote the book Liaison about the affair, would later attribute Boursicot’s belief that Shi was a woman to Shi’s unique ability to retract his own testicles, which, combined with the manipulation of his own penis, created the illusion of labial lips and a clitoris and allowed for shallow penetration.
There were M Butterfly and movie … and here is a Chinese version.