Clitoris

The clitoris was a sex organ.

Dark-haired Sam Jones wrote a note to blonde Sam Jones about her intimate relationship with Fitz Kreiner. Regarding sex, blonde Sam chose not to read the part where dark Sam said, "He [was] pretty damn good for someone from before they discovered the clitoris". (PROSE: Unnatural History)

Veteran Isaac Denikin and Bernice Summerfield once drank together at a hotel bar. He told her about life on Mars during the siege and she told her life story. The next morning, a hungover Benny recalled using the word "clitoris" at one point but could not remember the context. (PROSE: Beige Planet Mars)