When was the word ladyparts first used to describe the genitalia of a woman?
I tried to look it up in the British National Corpus but it returned no results.
It appears to be very recent slang, and hasn't yet been added to any dictionaries other than Urban Dictionary (defined in 2009 and quoted in another definition in 2006) and Wiktionary (added in 2011), as defined:
The earliest use found in Google Books is in a snippet from 1970, The Pretenders: A Novel by Gwen Davis, but this may be a one off rather than an indication it was well-known slang. It's also a snippet so there's a chance the 1970 date is incorrect:
Lady parts, lady's parts and ladyparts were used in Usenet posts in the '90s, for example this from 1999:
It was either already popular or was popularised by American sitcom The 70's Show, where it was used at least twice in 2002.
That '70s Show - "Heartbreaker" (29 Oct. 2002, season 5, episode 4):
That '70s Show - "Over the Hills and Far Away" (19 Nov. 2002, season 5, episode 6):