Conversation so far:
Who was Janet Gaynor romantically involved?
Gaynor was romantically involved with her friend and frequent co-star, Charles Farrell, during the time of their work together in silent film, until she married her first husband.
How many times did Janet Gaynor marry?
Gaynor was married three times and had one child.
Who did Janet Gaynor marry the first time?
Douglas Fairbanks Jr.
Who did Janet Gaynor marry in 1939?
On August 14, 1939, she married MGM costume designer Gilbert Adrian in Yuma, Arizona.

Question: Why was Janet Gaynor marriage to Gilbert Adrian was called a lavender marriage?
Self-contained rewrite: Why was Janet Gaynor marriage to Gilbert Adrian was called a lavender marriage?