It's also broadly hinted at in one of the Lost Age novels that Kirk impregnated Rand with a daughter that died at the age of two. Her pregnancy was why she left the Enterprise, but Kirk never knew.The novel was The Captain's Daughter I thought the backstory hinted at was that the evil Kirk from "The Enemy Within" succeeded in raping Rand? IIRC, she kept all knowledge of the baby and the incident from Kirk.This story idea is absolutely hateful ... and I am so glad we never saw anything like this happening to Rand on the show!
Indeed. She 'fesses all to Captain Sulu. It's actually one of my favourite ever Star Trek novels (I still make time to read it once a year), but that part I'm a little squeamish about.