Note I am not asking WHY ("Dick" became synonymous with "penis" in American vernacular) but rather WHEN this new meaning and subsequent aversion took place.
The youngest Richard I know who still goes by Dick is in his late 50s (58 to be exact). I don't know any Richard's in their 40s or younger who go by Dick. It's always Rick, Rich, Rip or just Richard. Never Dick. When did this happen? Was there a single incident that caused it?
Comic book - related sidenote: Do you think if the Batverse ever gets a hard reboot (a la Man of Steel by John Byrne for the Superverse in 1986), Richard Grayson will drop the Dick and go by Rick Grayson instead? He looks like a Rick to me anyway.